Hang Son Doong is in Phong Nha-Ke Bang National Park in Vietnam, near the border with Laos and is the world's largest natural ...

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two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...

As if that wasn't enough, the Mer de Glace's world-famous ice caves provide an awesome ... The Mer de Glace (or "sea of ice") is France's largest glacier, covering around 15 square miles on ...

Mammoth Cave is the largest network of caverns in the world that we know about Preserved by the USA’s National Park Service, there are 10 miles (16km) of the cave system accessible to the public ...

Set deep inside Phong Nha-Ke Bang National Park, it is one of dozens of caves found in the region ... us to reveal the beauty of underground world like never before. One of the greatest challenges ...

Traverse 330 steps on the way to such distinctive chambers as the “Devil’s Kitchen” and the “Crystal Vault.” Wild caving ...

In 2000, a Canadian diver became the first person to explore the underwater caves ... Women’s World Cup, the plasterer who fought a boxing legend, international football’s biggest ever beating ...

Škocjan Caves, the first Slovenian location inscribed on the Unesco World Heritage list, is considered the largest underground canyon in Europe. Inside it flows the Reka, the largest Slovenian ...