A milecastle was a small fort, a rectangular fortification built during the period of the Roman Empire. They were placed at intervals of approximately one Roman mile along several major frontiers, for
The remains of Milecastle 39 (Castle Nick), near Steel Rigg on Hadrian's Wall
Hadrian's Wall is a former defensive fortification of the Roman province of Britannia, begun in AD 122 in the reign of the Emperor Hadrian. Running from Wallsend on the River Tyne in the east to Bowne
Milecastle
…built during the period of the Roman Empire. They were placed at intervals of approximately one Roman mile along several major frontiers, for example Hadrian's Wall in Great Britain (Britannia in the Roman period), hence the name. Along Hadrian's Wall, milecastles were initially constructed of stone in the eastern…
A view of a partially-reconstructed section of Hadrian's Wall. The upright stones on top are a modern addition, to deter people from walking on it.
Sections of Hadrian's Wall still remain, particularly in its hilly central sector. Little remains in lowland regions, where it was used as a source of stone for new buildings.
Hadrian's Wall facing east towards Crag Lough (the lake in the picture). The rocky outcrop is the Whin Sill, of volcanic origin.
Bronze head of the Emperor Hadrian, who commissioned the wall's construction, found in 1834 in the River Thames in London, around 280 miles (450 km) south of Hadrian's Wall