Hang Son Doong, located near the Laos–Vietnam border, is the world's largest cave. Everything about it is on an epic scale: it's around nine kilometres (more than 5.5 miles) long, its largest chamber soars to a height of over 200 metres (660ft) and some of its stalagmites are 70 metres (230ft) tall. it's a space gigantic enough to squeeze in a few skyscrapers ... or perhaps park off a 747.

Cave -cam _2015_04_07
Screengrab/Ryan Deboot.

In Vietnamese, the name (roughly) means 'mountain river cave', and Hang Son Doong just happens to boast its own rapidly flowing underground river. And why stop there – there's a subterranean jungle, too. Thanks to a long-ago roof collapse that allowed sunlight to filter down into the depths, primeval-looking plants have been able to flourish beneath huge skylights, attracting monkeys, snakes and birds. Critters that might inhabit the cave's deeper reaches are just waiting to be studied.

Few people have been lucky enough to experience Hang Son Doong's hidden underground world – in fact, the cave was explored for the first time only recently, by British cavers in 2009. But even if cave exploration is not on your agenda, you can experience six minutes of vicarious wonder thanks to adventure and travel photographer Ryan Deboot, who took a camera drone along on his third visit to Hang Son Doong so he could truly capture its otherworldly beauty. (A few speck-like humans that feature in the resulting video will help you wrap your head around the cave's record-breaking scale.)

"It’s incredibly difficult to put into words how amazing Hang Son Doong really is. From the sheer size of the cave to the two dolines [skylights] where plant life has started growing inside the cave. It is truly otherworldly and something that probably can’t be experienced anywhere else in the world," writes Deboodt on his blog.

Our wanderlust is kicking in.

Top header image: Screengrab/Ryan Deboot

H/t: Smith Journal