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Farmer noticed a hole in the rock – and what was on the other side has amazed the whole world

Farmer noticed a hole in the rock – and what was on the other side has amazed the whole world

At more than 200 meters tall, it fit a 40-story skyscraper inside. And at more than 150 meters wide, it could comfortably hold a 747. Vietnam's Hang Son Doong is the largest cave in the world, and tours of the are really something extraordinary.

Scroll down to enter a magical underground world. This is unbelievably awesome!

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The giant cave is located in Vietnam's Phong Nha-Ke Bang National Park, 500 km south of the country's capital, Hanoi.

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Son Goong, or "Cave of the Mountain River," was created between 2 and 5 million years ago. But the massive cave was a hidden treasure until recently. A local farmer found an entrance in 1991, but it wasn't until 2009 that British experts properly explored the site.

Flickr/Hugh Derr

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The entire cave system has been estimated to be 139 kilometers long.

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It contains a whole world inside, including a rainforest, lakes, beaches, and a river.

Flickr/Hugh Derr

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Many caves contain relics from the past, such as paintings on the rock walls. But nothing of the sort has been found in this cave.

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In 2013, the first visitors toured the cave.

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Guided trips take seven days and cost $3,000. This includes five nights of camping in the cave.

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The cave is also rich in rare pearls, which are created when calcium salts form concentric layers around a grain of sand.

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