A small selection of abandoned military facilities of the past ^Offtopic...

• American Sherman tank off the coast of Saipan

• Soviet radio telescope, Latvia

• Runways on Tinian Island, Mariana Islands

• Small fort in the Philippines

• Tower forts built during World War II to protect against air attacks off the coast of England

• Hangar for military aircraft carved directly into the rock in Yugoslavia over 3 km long

• Anti-missile base, North Dakota, USA

• Experimental eavesdropping devices, England

• NATO submarine base in the rock, Norway.