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Humans like to build cities that reach for the sky, but sometimes they also build downward. Whether for protection, or just because they can, we've created many cities beneath the Earth's crust - or dug deep into the rocky faces of mountains. Here are ten of the most awesome. More »
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Even if you've been to the Catacombs of Paris or have gone spelunking in Brooklyn's abandoned subway lines, there's still a wealth of underground places to be explored. Here are some of the world's less welcoming manmade tunnels and grottos. More »
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The Barry Troglodyte Village is a small complex of homes build undeground in the south of France. Though underground homes are unusual, that's not the weirdest part about this place. These subterranean houses have been occupied continuously by people for thousands of years - from the neolithic era of roving tribes, to the early twentieth century. More »
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A Dutch company wants to build a massive underground city beneath Amsterdam, going six stories below the space-challenged city. Strukton, owned by the Dutch railway, wants to drain Amsterdam's canals one by one and then refill them with water after it builds its enormous troglodyte structure. The "web-like complex" would include parking, sports, movie theaters and warehouses... and people would hunt you down and kill you when you turn 35. More pics below. More »
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