Where: Derweze, Turkmenistan
A massive molten cavity known as the Darvaza crater – nicknamed the ‘door to hell’ is a continuous burning hole located in Derweze, Turkmenistan. The crater, which is 69 metres wide and 30 metres deep has been burning for the last 40 years. George Kourounis, a Canadian explorer, became the first person known to have ventured into the pit last year. His aim was to explore the hole and to check if there were any signs of life.