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More than 40 years ago, a gaping, fiery crater opened up in the desert of northern Turkmenistan, most likely after a drilling mishap, according to the National Geographic. The Darvaza Crater, known as the Door to Hell, is still burning, which is an odd occurrence since the landscape is actually barren. Rumor has it that Soviet scientists set it on fire to burn off noxious gases after the ground but underestimated the amount of fuel that lay below. Turkmenistan has the sixth largest natural gas reserves in the world.