HELSINKI -- Finland may be world's happiest country -- at least on the surface. But Helsinki's underground city tells a different story. Beneath the capital, a massive network of bunkers and tunnels spreads out all across the city.
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The cities of Özkonak, Derinkuyu, and Kaymakli in Cappadocia, Turkey, are some of the most complete (and most underground) of our underground cities. Denrikuyu is estimated to have once been capable of housing 20,000 people, and actually connects to Kaymakli via an underground tunnel, eight kilometers long.
Subterranean London refers to a number of subterranean structures that lie beneath London. The city has been occupied by humans for two millennia. Over time, the capital has acquired a vast number of these structures and spaces, often as a result of war and conflict.
London Underground is longer at 250 miles long to Paris Métro's titchy 133 miles. But the Métro has more lines (16 versus 11) and more stations (303) than London (270).