Why it's incredible: The entire gas crater has been on fire for more than 50 years. The "Gates of Hell," also known as the Darvaza gas crater after a nearby village, is a methane- and fire-filled ...

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Geologists set Turkmenistan's Darvaza gas crater ablaze in 1971, thinking the fire would die down within a few weeks, but the pit is still burning 53 years later. When you purchase through links on ...