Whitley Castle (Roman)

Whitley Castle is a large, unusually shaped Roman fort north-west of the town of Alston, Cumbria, England. The castrum, which was first built by the Roman Army early in the 2nd century AD, was partly demolished and rebuilt around 200 AD. It appears to have been sited to protect lead mining in the area as well as to support the border defences of Hadrian's Wall.

Unlike most Roman forts that have a "playing-card shape", Whitley Castle is lozenge-shaped to fit the site. Numerous banks and ditches ring the stone ramparts, making it among the most complex defensive earthworks of any fort known in the Roman Empire.