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Rough Castle is the best preserved of the Roman Forts on the Antonine Wall; it has an internal area of 0.4 hectares. For most of its perimeter, it is surrounded by two ditches. Immediately to the east of the fort is an annexe with three ditches at its eastern end. The Military Way is also well preserved here, and can be seen passing through fort and annexe. Defensive pits, nicknamed "lilia" ("lilies") by the Romans, can be seen beyond the northern extremity of the fort. The fort itself contained the headquarters building ("principia"), the commander's house, a granary, and barrack blocks. The annexe contained the regimental bath-house.
See Link (at Canmore) for further archaeological details. See Link for an annotated satellite view of the site.