Do not say the door to hell or the door to hell, but the name is really awesome. And to see this terrible place you have to go to Turkmenistan. In the history of this horrible place located near the village of Darwaja in Kara-kum desert area of Turkmenistan, it was found that in 1971, the then Soviet Union T Company operated excavation for exploration of gas fields. 
The same thing happened in our Maghurrs or Tengratilah. Huge explosion The gas field is closed. And he left a huge hole filled with fire. Methane gas is constantly being released from this hole and fire from it. The heat of this fire is such that it can not stand beyond 2 minutes. From then on it's name is Hell's door.