Overgrass Tower is a medieval tower house built in the 1400's situated in a wooded valley beside the Swarland Burn.

The ruin is built of large sandstone blocks with walls up to 5 feet thick and has a large vaulted basement. A later 18th century building has been built adjoining the tower, using some of its masonry. On the south-east side of the tower now largely collapsed was a stair now hidden beneath the undergrowth. 

The tower provides a pleasant walk from the track that crosses the river, turn immediately right through the wide gate and follow the path along the river a short distance. Sadly there is no recorded history associated to the tower.