21/09/2026
For years, this 50m concrete ring, easily seen from the top of Bomb Ballistics, has baffled staff, volunteers and visitors. What was it used for? Why was it there?
Thanks to volunteer researchers at IRGON (International Research Group Orford Ness), we now know that it was part of an innovative over-the-horizon radar system built during the Cold War, with its purpose to detect nuclear explosions and rocket launches.
Only eight structures of this type are thought to have been built around the world - including at Roswell in New Mexico.
Find out how the research - which involved using Google Earth, reading declassified files and flying over to America - led to the discovery on our website. The link is in the comments.
๐ธ: National Trust Images