Milecastle 80 was one of a series of Milecastles or small fortlets built at intervals of approximately one Roman mile along Hadrian's Wall.
Milefortlet 21 (Swarthy Hill) was a Milefortlet of the Roman Cumbrian Coast defences. These defences were contemporary with defensive structures on Hadrian's Wall. Its remains exist as reconstructed turf ramparts (to a height of about 1 metre (3.3 ft)) and ditch, reinstated to its original profile (also around 1 metre (3.3 ft)). They are located on a low cliff on the coast, north of the village of Crosscanonby, and just inland from the coastal road. It is the only milefortlet to have been fully excavated and is open to the public.
A turret was a small watch tower, incorporated into the curtain wall of Hadrian's Wall. The turrets were normally spaced at intervals of one third of a Roman mile between Milecastles, giving two Turrets between each Milecastle.
Milefortlet 1 (Biglands House) was a milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. The remains of Milefortlet 1 survive as a slight earthwork.
Milefortlet 3 (Pasture House) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground but Milefortlet 3 has been located on aerial photographs.
Milefortlet 4 (Herd Hill) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground but Milefortlet 4 has been located by archaeologists.
Milefortlet 5 (Cardurnock) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. The remains of Milefortlet 5 was excavated in 1943-4 prior to its destruction in 1944.
Milefortlet 9 (Skinburness) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground but Milefortlet 9 has been located on aerial photographs.
Milefortlet 12 (Blitterlees) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground but Milefortlet 12 has been located and excavated. The milefortlet is located close to the hamlet of Blitterlees, in the civil parish of Holme Low.
Milefortlet 16 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground but Milefortlet 16 has been located.
Milefortlet 17 (Dubmill Point) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see except a slight depression in the ground, but Milefortlet 17 has been located and surveyed.
Milefortlet 20 (Low Mire) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground, but Milefortlet 20 has been located and excavated.
Milefortlet 23 (Sea Brows) was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is nothing to see on the ground, but Milefortlet 23 has been located and surveyed.
Milefortlet 2 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. The exact location of Milefortlet 2 is unknown, although one of the nearby turrets has been located and excavated.
Milefortlet 13 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. The exact location of Milefortlet 13 is unknown, although two of the nearby turrets have been located and excavated.
Milefortlet 15 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. The site of Milefortlet 15 has been probably been destroyed by coastal erosion. A 3rd-century Roman cemetery, associated with a nearby fort at Beckfoot, was located in the area of the milefortlet.
Milefortlet 14 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. The site of Milefortlet 14 has never been identified and it may lie beneath the village of Beckfoot. A larger fort known as Bibra Roman Fort was located 500 metres south-west of Milefortlet 14.
Milefortlet 25 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. Milefortlet 25 is the southernmost known of the fortlets of the Cumberland coast, but there is nothing to see on the ground, as Milefortlet 25 lies in an industrial area of Maryport.
Milefortlet 11 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. Milefortlet 11 has never been accurately located on the ground although other Roman remains have been found in the area.
Milecastle 50TW (High House) was a milecastle on the Turf Wall section of Hadrian's Wall (grid reference NY60716583). The milecastle is located close to the Birdoswald Roman Fort and is unique in that it was not replaced by a stone milecastle when the turf wall was upgraded to stone, the replacement wall instead running some 200m to the north. The milecastle was partially demolished by the Romans after it was abandoned. The milecastle was excavated in 1934 and several Roman rubbish pits discovered. The remains of the two turrets associated with this milecastle (which were demolished when the turf wall was abandoned) have also been located. As the turf wall lies some distance from the stone wall, the sites are not accessible from the Hadrian's Wall Path.
