The Door to Hell, is situated near the small town of Darvaz in Turkmenistan. Thirty-five years ago, geologists were drilling for gas when then encountered a very large cavern underground filled with a poisonous gas. They ignited the gas expecting it to burn off in a few hours. The gas is still burning to this day. Its 60 meters in diameter and 20 meters depth have not been caused by volcanic activity or a meteorite impact.This crater was created sometime in the 50’s when the Soviets were prospecting for natural gas in this area and it’s been burning since then.
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Photographer John H. Bradley has more amazing photos of the Darvaz Burning Gas Crater: Link