Humans have discovered and stepped on almost every swath of terrain on the planet, yet there are still places that have not been explored. Modern spelunking expeditions are unlikely to produce such fantastical results as Jules Verne’s “A Journey to the Center of the Earth”, but there are still some stunning sights to behold. Here are nine amazing caves from around the world that will make your jaw drop:

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Full story by By Caitie Leary (Mother Nature Network)