Darvaza gas crater in the Turkmenistan

The gates of hell are various places on the surface of the world that have acquired a legendary reputation for being entrances to the underworld. Often they are found in regions of unusual geological activity, particularly volcanic areas, or sometimes at lakes, caves, or mountains.

The Darvaza gas crater, also known as the Door to Hell or Gates of Hell, is a natural gas field collapsed into a cavern located in Derweze, Turkmenistan. Geologists intentionally set it on fire to prevent the spread of methane gas and it is thought to have been burning continuously since 1971.