During the second World War Rockside was used as an RAF psychiatric hospital. Many RAF staff affected by the strain of repeated raids on the German city of Cologne found themselves here. On the left, Flight Sergeant Edward 'Bud' Caudwell and friend, possibly Corporal MacDonald. Edward Caudwell was a member of staff at the RAF pyschiatric hospital, noted for his rapport with his patients. Rockside Hydropathic Establishment was erected by Mr Charles Rowland, in 1862, and subsequently considerably enlarged. It was situated further up the hill from Smedley's Hydro at a height of 800 feet above the sea level, and could be reached conveniently and comfortably by the cable tram. It later became part of Matlock Teacher Training College, and has now been developed into apartments.