Anti-missile radar called "Duga" used to be a secret object during Soviet era. Hidden in the forest near Chernobyl-2 city in Ukraine, it was hardly to be detected even from 200 meters afar.
Even with super-wide lense it is difficult to capture full size of this huge structure. Once being top-secret Sovier military object, Duga radar is now open for visits. Chernobyl-2, Ukraine.