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10 Interesting Places to Explore the Underworld

10 Interesting Places to Explore the Underworld
(Photo: Tourism Holdings)
SmarterTravel

Fun goes underground with these 10 subterranean adventures. We’ve scoured the Earth for tunnels, caves, buried neighborhoods, and other treasures hidden beneath mountains, prisons, and even thriving cities. So go ahead and skip the sunscreen—you’re going underground.

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