This used to be part of the nearby Royal Air Force base in England and was used to process the photographs taken by U2 spy planes that had missions above the Eastern Bloc during the beginning of the Cold War. Later on they were replaced by satellite imagery technology and all the similar unit buildings fell into despair. Of course not much to see inside, most stuff been removed decades ago probably. It is now a private land and you better ask for permission before entering to avoid being shoot. Joking. Just keep an eye out for the landlord as he lives nearby.
Location: Wyton, England
Google Maps Coordinates: 52.34716, -0.12483