The fort at Carrawburgh is not on display, but remains as an impressive array of bumps in a field. Park in the small car park at the side of the road, however, and take a short walk around the fort's edge, as indicated on the explanatory boards, and you will come to the adjoining Roman Temple or Mithraeum. Statues and inscriptions from the site show that the Eastern god, Mithras, who originated in Persia, was worshipped here. He was the centre of a mysterious cult, popular with the army, which undertook dark mystical ceremonies, particularly hated by the Christians. You can step into the ruins here, but the altars are replicas and for a real feeling of what the place was like you must visit the full-scale reconstruction at the Museum of Antiquities in Newcastle. Conventina's well stood not far away.

The site is run by English Heritage. Free access at any reasonable time.