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| Some cities are so top secret they can't even be found on a map. Subterranean cities have existed throughout human history, and in the United States, we have a few amazing examples. Some are bunkers built during the Cold War to survive nuclear attacks, others were born as ingenious alternatives to escape extreme weather conditions. Whether they are hidden inside a mountain or buried deep underground, here are 12 subterranean places in America that are hidden in plain sight. |
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Learn these American facts! | |
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| As American as apple pie—the very best America has to offer! |
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| Delve into the astounding richness of American lore. |
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| Hop in and explore vast and diverse American landscapes. |
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| People and things that defined Americanness through the ages. |
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