At the southern end of the Castle Place is the ruin of Margaret's Castle, on the corner of Castle Place and Green Road.

At the southern end of the Castle Place is the ruin of  Margaret's Castle, a  late 15th century tower-house. This fortified dwelling was connected to others in the area by a defensive wall, but no sign of the walls remain. It is a small Tower house and only two storeys still exist, but there is evidence that it was at least three storeys high. It is vaulted above the ground floor with a rectangular tower with projecting turrets in the north west wall.

The doorway between the turrets was protected by a murder-hole. A spiral stairway rises within the west turret.