The Door to Hell, as local residents at the nearby town of Darvaza have dubbed it, is a 70 meter wide crater in Turkmenistan that has been burning continuously for 35 years.
The Derweze area is rich in natural gas. While drilling in 1971, Soviet geologists tapped into a cavern filled with natural gas.
The ground beneath the drilling rig collapsed, leaving a large hole with a diameter of 70 metres (230 ft) at 40°15′10″N 58°26′22″E. To avoid poisonous gas discharge, it was decided the best solution was to burn it off. Geologists had hoped the fire would use all the fuel in a matter of days, but the gas is still burning today. Locals have dubbed the cavern “The Door to Hell”.