Milecastle 4 was a milecastle of the Roman Hadrian's Wall. Its remains exist beneath the Newcastle Arts Centre at 67-75 Westgate Road. This position is some way away from its predicted position which is at these coordinates: 54.970440°N 1.608669°W The actual location is between the predicted positions of Turrets 4A and 4B, which has led to suggestions that the numbering and positioning of milecastles and turrets on this part of Hadrian's Wall should be reconsidered.
Milecastle 3 (Ouseburn) was a milecastle of the Roman Hadrian's Wall. No remains exist, but it was thought to have been located at the junction of the A187 Byker Bridge and Stephen Street.
Milecastle 0 is a possible milecastle of the Roman Hadrian's Wall which may have preexisted the fort of Segedunum. Although its existence has been suggested by historian Peter Hill, no evidence of this milecastle has been found. It is not known whether the decision to establish forts on the line of the wall predated the decision to extend the wall to Wallsend, so it is possible that this milecastle was never built.
Milecastle 2 (Walker) was a milecastle of the Roman Hadrian's Wall. No remains are currently visible, having been built over, but its probable location is at or near the junction of the A187 Fossway and Tunstall Avenue, in the parish of Wallsend.
Milecastle 6 was a milecastle of the Roman Hadrian's Wall.
Milecastle 7 was a milecastle of the Roman Hadrian's Wall. The milecastle itself has not been discovered by archaeologists and its presumed location lies beneath a modern housing development. Roman finds have been made in the area and the associated structure of Turret 7B is a significant surviving structure of the wall.
Milecastle 8 was a milecastle of the Roman Hadrian's Wall. Its remains are located in West Denton, Newcastle upon Tyne. The milecastle has two associated turret structures that are known as turret 8A and turret 8B. The turrets and milecastle were excavated in the 1920s, yielding some pottery and stone carvings, and have since been overlain by modern roads. The exact location of the structures is disputed, with the road hiding any surface traces. The Milecastle forms part of the Hadrian's Wall World Heritage Site.
Milecastle 9 was a milecastle of the Roman Hadrian's Wall. Its remains exist partially as a low platform, and are located in West Denton, 300 yards (270 m) from Chapel House Farm. However, the northern part of the remains are now mostly covered by the modern roads (A69/B6528). The milecastle marks a watershed between those with relatively well-defined positions and those whose position are less certain.
Milecastle 12 (Heddon) was a milecastle of the Roman Hadrian's Wall. Its remains lay under Town Farm, Heddon-on-the-Wall, with nothing visible on the surface.
Milecastle 13 was a milecastle of the Roman Hadrian's Wall. Its remains exist as a low platform south of the B6318 Military Road.
Milecastle 15 (Whitchester) was a milecastle of the Roman Hadrian's Wall. Its remains exist as a bold platform with robbed walls located on the southern side of the B6318 Military Road approximately 3 kilometres (1.9 mi) west of its crossing of the A69 road. It has not been excavated.
Milecastle 22 (Portgate) was a milecastle of the Roman Hadrian's Wall. Its remains exist as a low, turf covered platform just east of the Portgate roundabout. The platform is 0.5 metres (1.6 ft) on the east side, reducing to only a parch mark on the west side.
Milecastle 23 (Stanley) was a milecastle of the Roman Hadrian's Wall. Its remains exist as a low, grass covered platform with traces of an external ditch. It is located to the south of the B6318 Military Road around 1.5 kilometres (0.93 mi) west of its junction with the A68.
Milecastle 27 was a milecastle of the Roman Hadrian's Wall. It was located on the line of Hadrian's Wall, approximately midway between the A6079 and the River North Tyne. Its remains survive as a slight squarish platform with a maximum height of 0.4 metres (1.3 ft), but it is poorly defined to the north and east.
Milecastle 29 was a milecastle of the Roman Hadrian's Wall. Its remains exist as a mutilated earth platform accentuated by deep robber-trenches around all sides, and are located beside the B6318 Military Road. Like Milecastles 9, 23, 25, and 51, a ditch has been identified around the Milecastle, and is still visible to a small extent. It has been postulated that this was as a result of the need for drainage on the site.
Milecastle 30 was a milecastle of the Roman Hadrian's Wall. Its remains exist as an outward-facing scarp with a maximum height of 0.8 metres (2.6 ft). Masonry from the east wall remains in situ. The remaining stretch is 3.1 metres (10 ft) in length by 2.25 metres (7.4 ft) thick, and survives to a height of 0.6 metres (2.0 ft). It is located at the western part of Limestone Corner, just off the B6318 Military Road.
Milecastle 32 (Carraw) was a milecastle of the Roman Hadrian's Wall. Its remains exist as earthworks and with no exposed masonry. The layout of the milecastle walls is defined by robber trenches (to a maximum depth of 0.3 metres. The north wall is beneath a modern wall.
Milecastle 58 (Newtown) was a milecastle on Hadrian's Wall.
Milecastle 50TW was a milecastle on the Turf Wall section of Hadrian's Wall. 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 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.
Milecastle 70 (Braelees) was one of a series of Milecastles or small fortlets built at intervals of approximately one Roman mile along Hadrian's Wall.
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