Son Doong, the World’s largest cave which is located in Quang Binh province of Vietnam, is now open for public tours. However, unlike most tourist destinations, the cave is less likely to get crowded since only 224 tourists will be permitted to visit this year.

Oxalis Adventures, the only operator given permission to conduct tours to the cave has been working closely with local officials to make its availability to the public available, yet at the same time ensure a sustainable future for the cave. They announced that are able to accommodate only a limited number of guests, a maximum of eight at a time, on a 6-day tour. Each tour can take a day and a half where the guests are taken on a trek deep in Phong Nha Ke Bang National Park, through dense uninhabited jungle, cross stunning river valleys, 260ft downwards rappel to the cave entrance before being able to see the incredible cave formations that cannot be found elsewhere in the world. They admit that the mini-expedition is a bit strenuous and may not be for the faint-hearted, yet, the entire experience would be very worth the time and money. For those not aware of how much the tour will cost, it starts at $3,000 per person.

First discovered by a local Vietnamese in 1991, Son Doong cave got worldwide attention in 2009 when it was explored by a team from British Cave Research Association led by Howard Limbert. The cave is more than 5.5 miles long and could accommodate a 40-story skyscraper within its confines. Inside it has waterfalls, massive stalactites, and even a jungle.

Just this month, Sheikh Khalifa bin Zayed bin Sultan Al Nahyan, Crown Prince of Abu Dhabi, has completed a discovery trip to the cave. Reservations for explorations to the cave are currently ongoing. However, slot availability might run out quick and pretty soon the operator will halt on accepting reservations.