If you don't believe, you can also visit the place. It is about the Door to Hell which is in the Karakum Desert in Turkmenistan.
It exists since 1971 and was created by a wrong assessment of a Soviet geological team. A Soviet company that managed the mine decided to burn off the cavern in which there was methane gas and to let it burn out in 2 weeks. However, after 40 years, the fire still burns, with no chance to be quenched. This attraction is visited annually by over 10,000 tourists, mostly from Germany and the United States.