Yemen
The Well of Barhout (also nicknamed Well of Hell) is a sinkhole in Al-Mahara, Yemen. It has a circular entrance that measures about 30 m (100 ft) wide at the surface, and it is 112 metres (367 ft) deep.
Listen to the audio guide for بئر برÙÙت Free on WIP — starts by itself when you arrive, even with the screen off