60 metres high, 76 metres wide, an underground river that extends for 7 kilometres, the dimensions of Tham Khoun Xe are staggering! As a tourist, you can’t visit the entirety of the grotto because it can be dangerous in some places due to unstable walls, but the experienced adventurers have been able to photograph this incredible place.Mystic riverAs well as being geologically significant, this grotto is very important in Laos’ culture. Discovered in 1905 by the Frenchman Paul Macey, it is also mentioned in certain Laotian myths and legends. It is said that this grotto is home to spirits that watch over the people who live in the region, but also everyone that enters the grotto, protecting them from accidents.And believe it or not, no accident has been identified in the Tham Khoun Xe grotto since it was discovered! So, if Laos is on the list of your future holiday destinations, make sure to go visit this splendid place.