The site of Milecastle 30 at Limestone Corner

Milecastle 30 (Limestone Corner) 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 (both faces) 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).^[2] It is located at the western part of Limestone Corner, just off the B6318 Military Road.

• http://en.wikipedia.org/wiki/Milecastle 30