World's biggest cave in Vietnam has its own climate and clouds

STUNNING pictures show the inside of the largest cave on Earth.

By Laura Mitchell

This awe-inspiring cave in Vietnam is so big it could fit a 40-storey skyscraper inside. In fact, the Han Son Doong cave is so huge is has its own climate and clouds form inside its towering arches.

But the mystical attraction isn't for the faint-hearted as adventure-seeking tourists have to trek through the jungle to reach it.

The half-day walk takes travellers through tropical wilderness filled with butterflies and through knee-deep rivers, before finally reaching the immense cave.

COLOSSAL: The cave is so big it could fit a 40-storey skyscraper inside

On route, explorers will also pass through Hang Ev cave – the third largest cave in the world. This stunning grotto was recently used as a eerie backdrop for the Peter Pan blockbuster.

Swiss photographer Urs Zihlmann captured the Han Son Doong cave's beauty during a five-day trip to Ke Bang National Park.

MYSTIC: These stunning shots were captured by Swiss photographer Urs Zihlmann

EXPLORE: Tourists can trek through jungle to reach the save before spending the night campin...

The 35-year-old said: "I was very lucky to be able to go on a guided tour of the cave.

"As we approached the entrance, clouds were rising from the cave into the surrounding forest - we had to descend 262ft down a steep wall, using harnesses and ropes.

"Standing on the slippery ground in a huge, dark chamber, you begin to realise how amazing it is."

He continued: "You feel very small as a human being in this enormous, underground paradise - it has such an unearthly beauty."

"It felt like being in another world. Less people have seen the inside of Son Doong than stood on the summit of Mount Everest.

"It's a natural wonder at its best."

BEAUTIFUL: The Han Son Doong cave in Vietnam is so big it has its own climate

ADVENTURE: A five-day tour will set you back around £2,000

Oxalis Adventures run specialised photography trips into the impressive caves. A five-day, four-night tour will set you back $3,000 (around £2,000).

Tours of the cave are limited to 450 visitors each year and the company work with the Vietnamese government to prevent erosion.