Very few people are lucky enough to have the chance to witness the world’s greatest natural wonders. Son Doong, in Vietnam, is a great example of that.
This enormous cavern, the largest in the world, contains one of the planet’s oldest, most pristine ecosystems and is undoubtedly one of the most spectacular sights on earth.
It was only explored properly in 2009, with the help of the British Caving Association, and visitor numbers are limited to only 500 people a year. Oxalis, a Vietnamese adventure travel company, is the only operator to offer trips into the caves. It’s 2017 cave tours sold out within 20 hours last summer.