On an outcrop a few hundred yards to the east of — but visible from — the summit is Kinnoull Tower. Built in 1829 by Lord Grey of Kinfauns as a romantic folly, the tower, along with nearby Binn Tower, originally used as an observatory by Grey, are meant to resemble the castles on the Rhine in Germany as Grey saw a great similarity between the River Tay and parts of the Rhine.[1][2] The tower is easily accessible via a footpath.