Repentance Tower is a mid-16th century stone three storey tower house, founded by Sir John Maxwell of Terregles. Built as a square watchtower and not for comfort, the entrance is at first floor level and only small windows, gunloops and shot-holes give light. Built near the site of Trailtrow Chapel, the word 'Repentance' carved over the lintel maybe in connected with its demolition. Encased by a wall-walk and plain parapet, the roof was rebuilt and a stone fire beacon added, in the late 19th century. If an English raiding party crossed the border, the tower would light a beacon to warn Hoddom Castle. 6 miles south-west is Comlongon Castle.