Property Image Type Access Unitary authority Community Historic County Grid Reference Coordinates Ref. Barclodiad y Gawres Barclodiad y Gawres, Interior Burial Chamber Free Isle of Anglesey Aberffraw Anglesey SH329707 53°12′26″N 4°30′13″W / 53.2072°N 4.5036°W / 53.2072; -4.5036 (Barclodiad y Gawres Burial Chamber ) [1] Basingwerk Abbey Basingwerk Abbey Religious Free Flintshire Holywell Flintshire SJ196774 53°17′17″N 3°12′27″W / 53.288°N 3.2074°W / 53.288; -3.2074 (Basingwerk Abbey ) [2] Beaumaris Castle Beaumaris Castle Castle World Heritage Site . [3] Pay Isle of Anglesey Beaumaris Anglesey SH607762 53°15′54″N 4°05′23″W / 53.2649°N 4.0897°W / 53.2649; -4.0897 (Beaumaris Castle ) [4] Blaenavon Ironworks Industrial World Heritage Site . [5] Free Torfaen Blaenavon Monmouthshire SO249092 51°46′37″N 3°05′21″W / 51.777°N 3.0892°W / 51.777; -3.0892 (Blaenavon Ironworks ) [6] Bodowyr Burial Chamber Free Isle of Anglesey Llanidan Anglesey SH462681 53°11′18″N 4°18′10″W / 53.1882°N 4.3029°W / 53.1882; -4.3029 (Bodowyr Burial Chamber ) [7] Brecon Gaer Roman Fort Free Powys Yscir Brecknockshire SO003296 51°57′23″N 3°27′06″W / 51.9565°N 3.4517°W / 51.9565; -3.4517 (Brecon Gaer Roman Fort ) [8] Bronllys Castle Castle Free Powys Bronllys Brecknockshire SO149347 52°00′16″N 3°14′27″W / 52.0044°N 3.2407°W / 52.0044; -3.2407 (Bronllys Castle ) [9] Bryn Celli Ddu Burial Chamber Free Isle of Anglesey Llanddaniel Fab Anglesey SH507701 53°12′28″N 4°14′10″W / 53.2077°N 4.2361°W / 53.2077; -4.2361 (Bryn Celli Ddu Burial Chamber ) [10] Bryntail Industrial Free Powys Llanidloes Without Montgomeryshire SN913868 52°28′08″N 3°36′03″W / 52.4688°N 3.6008°W / 52.4688; -3.6008 (Bryntail Lead Mine Buildings ) [11] Caer Gybi Roman Fort Free Isle of Anglesey Holyhead Anglesey SH247826 53°18′42″N 4°37′55″W / 53.3116°N 4.632°W / 53.3116; -4.632 (Caer Gybi Roman Fortlet ) [12] Caer Lêb Enclosure Free Isle of Anglesey Llanidan Anglesey SH472674 53°10′55″N 4°17′12″W / 53.1819°N 4.2866°W / 53.1819; -4.2866 (Caer Lêb ) [13] Caer y Tŵr Hill Fort Free Isle of Anglesey Trearddur Anglesey SH219829 53°18′47″N 4°40′29″W / 53.3131°N 4.6747°W / 53.3131; -4.6747 (Caer y Tŵr ) [14] Caerleon Roman Fortress Roman Fort Free Newport Caerleon Monmouthshire ST337906 51°36′37″N 2°57′32″W / 51.6103°N 2.9588°W / 51.6103; -2.9588 (Caerleon Roman Fortress and Baths ) [15] Caernarfon Castle Castle World Heritage Site . [3] Pay Gwynedd Caernarfon Caernarvonshire SH477626 53°08′22″N 4°16′37″W / 53.1394°N 4.277°W / 53.1394; -4.277 (Caernarfon Castle ) [16] Caernarfon town walls Town Walls World Heritage Site . [3] Free Gwynedd Caernarfon Caernarvonshire SH479626 53°08′28″N 4°16′31″W / 53.141°N 4.2754°W / 53.141; -4.2754 (Caernarfon Town Walls ) [17] Caerphilly Castle Castle Pay Caerphilly Caerphilly Glamorganshire ST155870 51°34′35″N 3°13′14″W / 51.5763°N 3.2206°W / 51.5763; -3.2206 (Caerphilly Castle ) [18] Caerwent Roman Town Free Monmouthshire Caerwent Monmouthshire ST469907 51°36′45″N 2°46′06″W / 51.6126°N 2.7683°W / 51.6126; -2.7683 (Caerwent Roman Town ) [19] Capel Garmon Burial Chamber Free Conwy Bro Garmon Denbighshire SH817543 53°04′23″N 3°45′57″W / 53.073°N 3.7658°W / 53.073; -3.7658 (Capel Garmon Burial Chamber ) [20] Capel Lligwy Religious Free Isle of Anglesey Moelfre Anglesey SH499863 53°21′08″N 4°15′23″W / 53.3523°N 4.2564°W / 53.3523; -4.2564 (Capel Lligwy ) [21] Carew Cross Religious Free Pembrokeshire Carew Pembrokeshire SN047037 51°41′53″N 4°49′40″W / 51.698°N 4.8278°W / 51.698; -4.8278 (Carew Cross ) [22] Carreg Cennen Castle Castle Pay Carmarthenshire Dyffryn Cennen Carmarthenshire SN668190 51°51′16″N 3°56′07″W / 51.8545°N 3.9352°W / 51.8545; -3.9352 (Carreg Cennen Castle ) [23] Carreg Coetan Burial Chamber Free Pembrokeshire Newport Pembrokeshire SN060394 52°01′07″N 4°49′42″W / 52.0186°N 4.8282°W / 52.0186; -4.8282 (Carreg Coetan Arthur Burial Chamber ) [24] Carswell Medieval House Domestic Free (Ext.) Pembrokeshire Penally Pembrokeshire SN098010 51°40′34″N 4°45′08″W / 51.676°N 4.7523°W / 51.676; -4.7523 (Carswell Medieval House ) [25] Castell Bryn Gwyn Prehistoric Free Isle of Anglesey Llanidan Anglesey SH465670 53°10′42″N 4°17′52″W / 53.1784°N 4.2979°W / 53.1784; -4.2979 (Castell Bryn Gwyn ) [26] Castell Coch Castle Pay Cardiff Tongwynlais Glamorganshire ST130826 51°32′10″N 3°15′18″W / 51.536°N 3.2549°W / 51.536; -3.2549 (Castell Coch ) [27] Castell y Bere Castle Free Gwynedd Llanfihangel-y-Pennant Merionethshire SH667085 52°39′30″N 3°58′16″W / 52.6583°N 3.9711°W / 52.6583; -3.9711 (Castell y Bere ) [28] Chepstow, Bulwark Camp Prehistoric enclosure Free Monmouthshire Chepstow Monmouthshire ST538927 51°37′52″N 2°40′08″W / 51.6312°N 2.6689°W / 51.6312; -2.6689 (Chepstow Bulwarks Camp ) [29] Chepstow Castle Castle Pay Monmouthshire Chepstow Monmouthshire ST533940 51°38′37″N 2°40′32″W / 51.6437°N 2.6755°W / 51.6437; -2.6755 (Chepstow Castle ) [30] Chepstow Port Wall Town Walls Free Monmouthshire Chepstow Monmouthshire ST533937 51°38′25″N 2°40′34″W / 51.6404°N 2.6762°W / 51.6404; -2.6762 (Chepstow Port Wall ) [31] Cilgerran Castle Castle Pay Pembrokeshire Cilgerran Pembrokeshire SN194431 52°03′25″N 4°38′03″W / 52.0569°N 4.6342°W / 52.0569; -4.6342 (Cilgerran Castle ) [32] Coity Castle Castle Free Bridgend Coity Higher Glamorganshire SS923814 51°31′20″N 3°33′12″W / 51.5221°N 3.5534°W / 51.5221; -3.5534 (Coity Castle ) [33] Conwy Castle Castle World Heritage Site . [3] Pay Conwy Conwy Caernarvonshire SH783774 53°16′48″N 3°49′32″W / 53.2801°N 3.8256°W / 53.2801; -3.8256 (Conwy Castle ) [34] Conwy town walls Town Walls World Heritage Site . [3] Free Conwy Conwy Caernarvonshire SH780776 53°16′54″N 3°49′52″W / 53.2817°N 3.8312°W / 53.2817; -3.8312 (Conwy Town Walls ) [35] Criccieth Castle Castle Pay Gwynedd Criccieth Caernarvonshire SH499377 52°54′58″N 4°13′57″W / 52.916°N 4.2324°W / 52.916; -4.2324 (Criccieth Castle ) [36] Cymer Abbey Religious Free Gwynedd Llanelltyd Merionethshire SH721195 52°45′29″N 3°53′46″W / 52.7581°N 3.8962°W / 52.7581; -3.8962 (Cymer Abbey ) [37] Denbigh Castle Castle Pay Denbighshire Denbigh Denbighshire SJ051657 53°10′50″N 3°25′14″W / 53.1806°N 3.4206°W / 53.1806; -3.4206 (Denbigh Castle ) [38] Denbigh Friary Religious Free Denbighshire Denbigh Denbighshire SJ059665 53°11′16″N 3°24′33″W / 53.1878°N 3.4091°W / 53.1878; -3.4091 (Denbigh Friary ) [39] Denbigh Town Walls Town Walls Free Denbighshire Denbigh Denbighshire SJ052657 53°10′51″N 3°25′09″W / 53.1808°N 3.4191°W / 53.1808; -3.4191 (Denbigh Town Walls ) [40] Leicester's Church Religious Free Denbighshire Denbigh Denbighshire SJ053659 53°10′56″N 3°25′08″W / 53.1822°N 3.419°W / 53.1822; -3.419 (Denbigh, Leicester's Church ) [41] St Hilary's Chapel Religious Free Denbighshire Denbigh Denbighshire SJ052659 53°10′54″N 3°25′11″W / 53.1818°N 3.4198°W / 53.1818; -3.4198 (Denbigh, St Hilary's Chapel ) [42] Derwen Churchyard Cross Religious Free Denbighshire Derwen Denbighshire SJ070507 53°02′45″N 3°23′18″W / 53.0457°N 3.3882°W / 53.0457; -3.3882 (Derwen Churchyard Cross ) [43] Din Dryfol Burial Chamber Free Isle of Anglesey Aberffraw Anglesey SH395724 53°13′30″N 4°24′17″W / 53.225°N 4.4048°W / 53.225; -4.4048 (Din Dryfol Burial Chamber ) [44] Din Lligwy Hut Group Free Isle of Anglesey Moelfre Anglesey SH497861 53°21′03″N 4°15′33″W / 53.3508°N 4.2592°W / 53.3508; -4.2592 (Din Lligwy Hut Group ) [45] Dinefwr Castle Castle Free Carmarthenshire Llandeilo Carmarthenshire SN622224 51°52′36″N 4°01′07″W / 51.876776°N 4.018562°W / 51.876776; -4.018562 (Dinefwr Castle ) [46] Dolbadarn Castle Castle Free Gwynedd Llanberis Caernarvonshire SH586598 53°07′00″N 4°06′51″W / 53.1166°N 4.1143°W / 53.1166; -4.1143 (Dolbadarn Castle ) [47] Dolforwyn Castle Castle Free Powys Llandyssil Montgomeryshire SO151950 52°32′47″N 3°15′09″W / 52.5464°N 3.2525°W / 52.5464; -3.2525 (Dolforwyn Castle ) [48] Dolwyddelan Castle Castle Pay Conwy Dolwyddelan Caernarvonshire SH721523 53°03′11″N 3°54′30″W / 53.0531°N 3.9084°W / 53.0531; -3.9084 (Dolwyddelan Castle ) [49] Dryslwyn Castle Castle Free Carmarthenshire Llangathen Carmarthenshire SN554203 51°51′48″N 4°06′03″W / 51.8632°N 4.1007°W / 51.8632; -4.1007 (Dryslwyn Castle ) [50] Dyffryn Ardudwy Burial Chamber Free Gwynedd Dyffryn Ardudwy Merionethshire SH588228 52°47′05″N 4°05′37″W / 52.7846°N 4.0937°W / 52.7846; -4.0937 (Dyffryn Ardudwy Burial Chamber ) [51] Dyfi Furnace Industrial Free Ceredigion Ysgubor-y-coed Cardiganshire SN684950 52°32′16″N 3°56′25″W / 52.5378°N 3.9404°W / 52.5378; -3.9404 (Dyfi Furnace ) [52] Eliseg's Pillar Religious Free Denbighshire Llantysilio Denbighshire SJ202445 52°59′32″N 3°11′21″W / 52.9921°N 3.1893°W / 52.9921; -3.1893 (Eliseg's Pillar ) [53] Ewenny Priory Religious Free The Vale of Glamorgan Ewenny Glamorganshire SS912778 51°29′20″N 3°34′03″W / 51.4888°N 3.5676°W / 51.4888; -3.5676 (Ewenny Priory ) [54] Ewloe Castle Castle Free Flintshire Hawarden Flintshire SJ288675 53°12′00″N 3°04′02″W / 53.2°N 3.0672°W / 53.2; -3.0672 (Ewloe Castle ) [55] Flint Castle Castle Free Flintshire Flint Flintshire SJ246732 53°15′04″N 3°07′48″W / 53.2511°N 3.1301°W / 53.2511; -3.1301 (Flint Castle ) [56] Grosmont Castle Castle Free Monmouthshire Grosmont Monmouthshire SO405244 51°54′55″N 2°51′57″W / 51.9154°N 2.8657°W / 51.9154; -2.8657 (Grosmont Castle ) [57] Gwydir Uchaf Chapel Religious Free Conwy Trefriw Caernarvonshire SH794609 53°07′55″N 3°48′10″W / 53.1319°N 3.8028°W / 53.1319; -3.8028 (Gwydir Uchaf Chapel ) [58] Hafoty Medieval House Domestic Free (Ext.) Isle of Anglesey Cwm Cadnant Anglesey SH562781 53°16′51″N 4°09′28″W / 53.2809°N 4.1579°W / 53.2809; -4.1579 (Hafoty Medieval House ) [59] Harlech Castle Castle World Heritage Site . [3] Pay Gwynedd Harlech Merionethshire SH581312 52°51′37″N 4°06′33″W / 52.8602°N 4.1091°W / 52.8602; -4.1091 (Harlech Castle ) [60] Haverfordwest Priory Religious Free Pembrokeshire Haverfordwest Pembrokeshire SM956151 51°47′51″N 4°57′51″W / 51.7976°N 4.9643°W / 51.7976; -4.9643 (Haverfordwest Priory ) [61] Hen Gwrt Moated Site Domestic Free Monmouthshire Llantilio Crossenny Monmouthshire SO395151 51°49′53″N 2°52′42″W / 51.8315°N 2.8782°W / 51.8315; -2.8782 (Hen Gwrt Moated Site ) [62] Holyhead Mountain Hut Circles Hut Group Free Isle of Anglesey Trearddur Anglesey SH212820 53°18′19″N 4°41′02″W / 53.3054°N 4.6838°W / 53.3054; -4.6838 (Holyhead Mountain Hut Circles ) [63] Kidwelly Castle Castle Pay Carmarthenshire Kidwelly Carmarthenshire SN409070 51°44′23″N 4°18′20″W / 51.7398°N 4.3055°W / 51.7398; -4.3055 (Kidwelly Castle ) [64] Lamphey Bishop's Palace Religious Free Pembrokeshire Lamphey Pembrokeshire SN018009 51°40′19″N 4°52′00″W / 51.672°N 4.8668°W / 51.672; -4.8668 (Lamphey Bishop's Palace ) [65] Laugharne Castle Castle Pay Carmarthenshire Laugharne Township Carmarthenshire SN302107 51°46′11″N 4°27′44″W / 51.7696°N 4.4621°W / 51.7696; -4.4621 (Laugharne Castle ) [66] Llangar Church Religious Pay Denbighshire Cynwyd Merionethshire SJ063424 52°58′16″N 3°23′45″W / 52.9712°N 3.3959°W / 52.9712; -3.3959 (Llangar Old Parish Church ) [67] Llanmelin Wood Hill Fort Hill Fort Free Monmouthshire Caerwent Monmouthshire ST461925 51°37′45″N 2°46′46″W / 51.6291°N 2.7794°W / 51.6291; -2.7794 (Llanmelin Wood Hill Fort ) [68] Llansteffan Castle Castle Free Carmarthenshire Llansteffan Carmarthenshire SN351101 51°45′56″N 4°23′27″W / 51.7655°N 4.3908°W / 51.7655; -4.3908 (Llansteffan Castle ) [69] Llanthony Priory Religious Free Monmouthshire Crucorney Monmouthshire SO289278 51°56′41″N 3°02′11″W / 51.9448°N 3.0364°W / 51.9448; -3.0364 (Llanthony Priory ) [70] Llawhaden Castle Castle Free Pembrokeshire Llawhaden Pembrokeshire SN073175 51°49′20″N 4°47′51″W / 51.8223°N 4.7976°W / 51.8223; -4.7976 (Llawhaden Castle ) [71] Lligwy Burial Chamber Burial Chamber Free Isle of Anglesey Moelfre Anglesey SH501860 53°21′00″N 4°15′10″W / 53.3499°N 4.2529°W / 53.3499; -4.2529 (Lligwy Burial Chamber ) [72] Loughor Castle Castle Free Swansea Llwchwr Glamorganshire SS564979 51°39′44″N 4°04′38″W / 51.6622°N 4.0771°W / 51.6622; -4.0771 (Loughor Castle ) [73] Maen Achwyfan Cross Religious Free Flintshire Whitford Flintshire SJ128787 53°17′55″N 3°18′31″W / 53.2987°N 3.3085°W / 53.2987; -3.3085 (Maen Achwyfan Cross ) [74] Margam Stones Museum Religious Pay Neath Port Talbot Margam Glamorganshire SS801864 51°33′49″N 3°43′52″W / 51.5637°N 3.7312°W / 51.5637; -3.7312 (Margam Stones Museum ) [75] Monmouth Castle Castle Free Monmouthshire Monmouth Monmouthshire SO506128 51°48′45″N 2°43′00″W / 51.8125°N 2.7167°W / 51.8125; -2.7167 (Monmouth Castle ) [76] Montgomery Castle Castle Free Powys Montgomery Montgomeryshire SO221967 52°33′48″N 3°09′00″W / 52.5632°N 3.1501°W / 52.5632; -3.1501 (Montgomery Castle ) [77] Neath Abbey Religious Free Neath Port Talbot Dyffryn Clydach Glamorganshire SS738974 51°39′40″N 3°49′34″W / 51.6612°N 3.826°W / 51.6612; -3.826 (Neath Abbey and Gatehouse ) [78] Newcastle Castle Castle Free Bridgend Bridgend Glamorganshire SS902800 51°30′32″N 3°34′59″W / 51.5089°N 3.583°W / 51.5089; -3.583 (Newcastle, Bridgend ) [79] Newport Castle Castle Free Newport Stow Hill Monmouthshire ST311884 51°35′27″N 2°59′42″W / 51.5908°N 2.9951°W / 51.5908; -2.9951 (Newport Castle ) [80] Ogmore Castle Castle Free The Vale of Glamorgan St Bride's Major Glamorganshire SS881769 51°28′50″N 3°36′41″W / 51.4805°N 3.6115°W / 51.4805; -3.6115 (Ogmore Castle ) [81] Old Beaupre Castle Castle Free The Vale of Glamorgan Llanfair Glamorganshire ST008720 51°26′19″N 3°25′39″W / 51.4385°N 3.4274°W / 51.4385; -3.4274 (Old Beaupre Castle ) [82] Oxwich Castle Castle Pay Swansea Penrice Glamorganshire SS497862 51°33′20″N 4°10′06″W / 51.5555°N 4.1683°W / 51.5555; -4.1683 (Oxwich Castle ) [83] Parc le Breos Burial Chamber Free Swansea Ilston Glamorganshire SS537898 51°35′18″N 4°06′46″W / 51.5883°N 4.1128°W / 51.5883; -4.1128 (Parc le Breos Burial Chamber ) [84] Penarth Fawr Medieval House ? Gwynedd Llanystumdwy Caernarvonshire SH419376 52°54′48″N 4°21′09″W / 52.9132°N 4.3524°W / 52.9132; -4.3524 (Penarth Fawr Medieval House ) [85] Penmon Cross Religious Free Isle of Anglesey Llangoed Anglesey SH630807 53°18′21″N 4°03′24″W / 53.3058°N 4.0568°W / 53.3058; -4.0568 (Penmon Cross ) [86] Penmon Dovecote Domestic Free Isle of Anglesey Llangoed Anglesey SH631807 53°18′20″N 4°03′21″W / 53.3056°N 4.0557°W / 53.3056; -4.0557 (Penmon Dovecote ) [87] Penmon Priory Religious Free Isle of Anglesey Llangoed Anglesey SH630807 53°18′20″N 4°03′24″W / 53.3055°N 4.0568°W / 53.3055; -4.0568 (Penmon Priory ) [88] St Seiriol's Well Religious Free Isle of Anglesey Llangoed Anglesey SH630808 53°18′23″N 4°03′24″W / 53.3064°N 4.0566°W / 53.3064; -4.0566 (Penmon, St Seiriol's Well ) [89] Penrhos Feilw Standing Stones Prehistoric Free Isle of Anglesey Trearddur Anglesey SH227809 53°17′45″N 4°39′42″W / 53.2957°N 4.6618°W / 53.2957; -4.6618 (Penrhos Feliw Standing Stones ) [90] Pentre Ifan Burial Chamber Free Pembrokeshire Nevern Pembrokeshire SN099370 51°59′57″N 4°46′12″W / 51.9991°N 4.7701°W / 51.9991; -4.7701 (Pentre Ifan Burial Chamber ) [91] Plas Mawr , Conwy Domestic Pay Conwy Conwy Caernarvonshire SH780775 53°16′52″N 3°49′48″W / 53.2812°N 3.83°W / 53.2812; -3.83 (Plas Mawr ) [92] Pont Minllyn Bridge Free Gwynedd Mawddwy Merionethshire SH859138 52°42′38″N 3°41′21″W / 52.7106°N 3.6891°W / 52.7106; -3.6891 (Pont Minllyn ) [93] Presaddfed Burial Chamber Free Isle of Anglesey Bodedern Anglesey SH347808 53°17′57″N 4°28′51″W / 53.2992°N 4.4809°W / 53.2992; -4.4809 (Presaddfed Burial Chamber ) [94] Raglan Castle Castle Pay Monmouthshire Raglan Monmouthshire SO417085 51°46′13″N 2°50′59″W / 51.7702°N 2.8498°W / 51.7702; -2.8498 (Raglan Castle ) [95] Rhuddlan Castle Castle Pay Denbighshire Rhuddlan Flintshire SJ024779 53°17′21″N 3°27′54″W / 53.2891°N 3.465°W / 53.2891; -3.465 (Rhuddlan Castle ) [96] Rug Chapel Religious Pay Denbighshire Corwen Merionethshire SJ064438 52°59′03″N 3°23′39″W / 52.9842°N 3.3942°W / 52.9842; -3.3942 (Rug Chapel / Llangar Old Parish Church ) [97] Runston Chapel Religious Monmouthshire Mathern Monmouthshire ST496915 51°37′13″N 2°43′45″W / 51.6204°N 2.7293°W / 51.6204; -2.7293 (Runston Chapel ) [98] Segontium Roman Fort Roman Fort Free Gwynedd Caernarfon Caernarvonshire SH485624 53°08′14″N 4°15′58″W / 53.1372°N 4.2662°W / 53.1372; -4.2662 (Segontium Roman Fort ) [99] Skenfrith Castle Castle Free Monmouthshire Llangattock-Vibon-Avel Monmouthshire SO456203 51°52′43″N 2°47′25″W / 51.8786°N 2.7904°W / 51.8786; -2.7904 (Skenfrith Castle ) [100] St Cybi's Well Religious Free Gwynedd Llangybi Gwynedd SH427413 52°56′45″N 4°20′32″W / 52.945735°N 4.342090°W / 52.945735; -4.342090 (St Cybi's Well ) [101] St Davids Bishop's Palace Religious Pay Pembrokeshire St Davids Pembrokeshire SM750254 51°52′56″N 5°16′15″W / 51.8821°N 5.2708°W / 51.8821; -5.2708 (St Davids Bishop's Palace ) [102] St Dogmaels Abbey Religious Free Pembrokeshire St Dogmaels Pembrokeshire SN164458 52°04′50″N 4°40′50″W / 52.0806°N 4.6806°W / 52.0806; -4.6806 (St Dogmaels Abbey and Coach House ) [103] St Lythans burial chamber Burial Chamber Free The Vale of Glamorgan Wenvoe Glamorganshire ST100723 51°26′33″N 3°17′42″W / 51.4426°N 3.2951°W / 51.4426; -3.2951 (St Lythans Burial Chamber ) [104] St Non's Chapel Religious Free Pembrokeshire St Davids Pembrokeshire SM750243 51°52′20″N 5°16′08″W / 51.8722°N 5.2689°W / 51.8722; -5.2689 (St Non's Chapel ) [105] St Quentin's Castle , Llanblethian Castle Free The Vale of Glamorgan Cowbridge with Llanblethian Glamorganshire SS989741 51°27′27″N 3°27′23″W / 51.4576°N 3.4564°W / 51.4576; -3.4564 (St Quentin's Castle, Llanblethian ) [106] St Winefride's Chapel and Holywell Religious Free Flintshire Holywell Flintshire SJ185762 53°16′38″N 3°13′25″W / 53.2771°N 3.2236°W / 53.2771; -3.2236 (St Winifred's Chapel and Holy Well ) [107] Strata Florida Abbey Religious Pay Ceredigion Ystrad Fflur Cardiganshire SN746657 52°16′31″N 3°50′18″W / 52.2752°N 3.8383°W / 52.2752; -3.8383 (Strata Florida Abbey ) [108] Swansea Castle Castle Free (External only) Swansea Swansea Glamorganshire SS657930 51°37′14″N 3°56′28″W / 51.6205°N 3.9411°W / 51.6205; -3.9411 (Swansea Castle ) [109] Talley Abbey Religious Free Carmarthenshire Talley Carmarthenshire SN632327 51°58′35″N 3°59′32″W / 51.9765°N 3.9922°W / 51.9765; -3.9922 (Talley Abbey ) [110] Tinkinswood Burial Chamber Free The Vale of Glamorgan St Nicholas and Bonvilston Glamorganshire ST092732 51°27′05″N 3°18′26″W / 51.4513°N 3.3072°W / 51.4513; -3.3072 (Tinkinswood Burial Chamber ) [111] Tintern Abbey Religious Pay Monmouthshire Tintern Monmouthshire SO533000 51°41′49″N 2°40′36″W / 51.6969°N 2.6768°W / 51.6969; -2.6768 (Tintern Abbey ) [112] Trefignath Burial Chamber Free Isle of Anglesey Trearddur Anglesey SH258805 53°17′36″N 4°36′51″W / 53.2932°N 4.6142°W / 53.2932; -4.6142 (Trefignath Burial Chamber ) [113] Tregwehelydd Standing Stone Prehistoric Free Isle of Anglesey Tref Alaw Anglesey SH340831 53°19′10″N 4°29′33″W / 53.3195°N 4.4926°W / 53.3195; -4.4926 (Tregwehelydd Standing Stone ) [114] Tretower Castle Castle Pay Powys Llanfihangel Cwmdu Brecknockshire SO184212 51°53′02″N 3°11′10″W / 51.8839°N 3.1862°W / 51.8839; -3.1862 (Tretower Castle ) [115] Tretower Court Castle Pay Powys Llanfihangel Cwmdu Brecknockshire SO185211 51°53′00″N 3°11′05″W / 51.8832°N 3.1846°W / 51.8832; -3.1846 (Tretower Court ) [116] Twthill Castle Mound Free Denbighshire Rhuddlan Flintshire SJ026776 53°17′14″N 3°27′43″W / 53.2871°N 3.4619°W / 53.2871; -3.4619 (Twthill, Rhuddlan ) [117] Tŷ Mawr Standing Stone Prehistoric Free Isle of Anglesey Holyhead Anglesey SH253809 53°17′48″N 4°37′17″W / 53.2967°N 4.6214°W / 53.2967; -4.6214 (Ty Mawr Standing Stone ) [118] Tŷ Newydd Burial Chamber Burial Chamber Free Isle of Anglesey Llanfaelog Anglesey SH344738 53°14′09″N 4°28′57″W / 53.2359°N 4.4824°W / 53.2359; -4.4824 (Tŷ Newydd Burial Chamber ) [119] Valle Crucis Abbey Religious Pay Denbighshire Llantysilio Denbighshire SJ204441 52°59′20″N 3°11′12″W / 52.9888°N 3.1867°W / 52.9888; -3.1867 (Valle Crucis Abbey ) [120] Weobley Castle Castle Pay Swansea Llanrhidian Lower Glamorganshire SS478927 51°36′46″N 4°11′57″W / 51.6128°N 4.1993°W / 51.6128; -4.1993 (Weobley Castle ) [121] White Castle Castle Free Monmouthshire Llantilio Crossenny Monmouthshire SO379167 51°50′46″N 2°54′08″W / 51.8461°N 2.9022°W / 51.8461; -2.9022 (White Castle ) [122] Wiston Castle Castle Free Pembrokeshire Wiston Pembrokeshire SN022181 51°49′36″N 4°52′16″W / 51.8268°N 4.8711°W / 51.8268; -4.8711 (Wiston Castle ) [123] 
