Remains of the
High Power Auroral Stimulation (HIPAS) Observatory in Two Rivers, Alaska - according to
Wikipedia they got up to all sorts of things, including heating the ionosphere in order to create artificial aurorae, spinning mercury to form curved mirrors, and disposing of hazardous waste using a
plasma torch. All gone now...
The Atlantic Ghost Fleet - lovely photos of the French Navy's ghost fleet in Brest, Brittany. Nautical rust!
Nato Bunker Kemmelberg - former Nato bunker in Belgium, for your cold war paranoiac needs.
Compare Britain's Secret Nuclear Bunker!