Hadrian's Wall - Milecastle 21 - Halton Shields

Milecastle

Milecastle 21 (Down Hill) was a – Milecastle of the Roman Hadrian’s Wall. The site was identified by measurement only, as the – Milecastle’s remains have been totally removed. This is probably due to extensive quarrying at the site, which now lies under pasture (and partly beneath the Military Road).