Walls of the Roman bath house at Glannoventa still stand four metres high — the tallest Roman remains in northern England. They sit a short walk south of Ravenglass village, in a damp wood reached by a footpath signed off the lane. Two arched window openings and the doorways of the warm and hot rooms are clearly visible; flue tiles set into the inner faces of the walls show where heated air once circulated.
The bath house served the Roman naval base of Glannoventa, established around AD 130 to control the western flank of Hadrian's Wall. The fort itself, half a mile inland, was destroyed by ploughing centuries ago, but the bath house was unintentionally preserved by being repurposed as a livestock shelter. Access is free, the path open at all times; bring boots in wet weather.