A quarter of a mile up the hill from Birstall on Leeds Road, there was once a Roman watch tower. This observation point was built on the ridge or "brae" of the hill. One side overlooked the Birstall area, while the other looked downwards from Howden Clough and the valley towards upland Morley. This watchtower was known in the early 20th century to the local inhabitants as the Brass Castle, a corruption of Brae Castle. It followed the line of other such structures built in West Yorkshire, atop prominent projecting ridges.