Coordinates: 55°01′04″N 2°03′47″W / 55.017825°N 2.063043°W / 55.017825; -2.063043
Milecastle 24 (Wall Fell) was a milecastle of the Roman Hadrian's Wall. Its remains exist as a low platform, and are located to the south of the B6318 Military Road around 3 kilometres (1.9 mi) west of its junction with the A68.
Because of the similarity in its construction to that of Milecastle 23, Milecastle 24 is assumed to be a long-axis milecastle. The gateway type is unknown, though long-axis milecastles were thought to have been constructed by the Legio VI Victrix who were based in Eboracum (York).
The milecastle measured 15.24 metres (50.0 ft) across, and had broad east and west walls (the curtain wall at this point was also broad gauge).
A change in the vegetation in the ditch adjacent to the south gateway may suggest the prior existence of a causeway that was subsequently removed.).