The oldest structure in the area is the remains of a vitrified fort on the top of Wester Craiglockhart Hill, which is of prehistoric origin. This was somewhat mutilated by the addition of gun-emplacements in World War II, guarding against aerial attack. Excavations show the fort was re-occupied during Roman times. Craiglockhart Castle dates from the 15th century but is now ruined. The hill is also a Site of Special Scientific Interest (SSSI) due to its diverse biological habitat.