The Darvaza gas crater (Turkmen media use the name Shining of the Karakum: Turkmen: Garagum ýalkymy), also known as the Door to Hell or Gates of Hell, is a burning natural gas field collapsed into a cavern near Darvaza, Turkmenistan.

Accurate records of how the crater ignited have not been discovered, and some facts are disputed. One of the more popular theories is that Soviet geologists intentionally set it on fire in 1971 to stop the leaking of methane gas, and it is thought to have been burning continuously ever since. Its diameter is 69 m (226 ft), and its depth is 30 m (98 ft).

The crater has become a popular tourist attraction. The surrounding area is also popular for wild desert camping.

More Info: en.wikipedia.org