Mysterious Underground Cities Revealed

Dec 22, 2015 at 4:40 pm |
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You had no idea these even existed...until now...

Why were they built? Who built them? Mysterious underground cities have been found around the world, and the questions around them are infinite. Were they protection from war or weather? Were they for religious purposes? Or was it something else entirely…

Wieliczka Salt Mine, Poland

Source: Imgur/Svartsinn

You had no idea these even existed…until now…

Check out our slideshow to learn more about these underground cities!
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