45. Craigowl Hill, Dundee. (NO 377 400)

The British Telecom microwave relay station on top of Craigowl Hill provided intelligence-gathering facilities for the US National Security Agency from 1963 onwards and may still do. The activities of the NSA at Craigowl were secret until 1980 and despite a public outcry were not denied. Craigowl was linked to the NSA's electronic monitoring station at Menwith Hill in Yorkshire.