The White House to Treasury Building tunnel is a 761-foot (232 m) subterranean structure in Washington, D.C. that connects a sub-basement of the East Wing of the White House to the areaway which surrounds the United States Treasury Building.
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Turkey's Cappadocia region contains hundreds of underground cities. Derinkuyu happens to be the deepest and most intricate. It is capable of hiding 20,000 people within the tunnels and chambers carved out of volcanic rock. On the outside, the entrance looks almost completely hidden and easily missed.
The most important military citadel in central London is Pindar, or the Defence Crisis Management Centre. The bunker is deep beneath the Ministry of Defence on Whitehall. Construction took ten years and cost £126.3 million. Pindar became operational in 1992, two years before construction was complete.