Sơn Đoòng Cave in Vietnam is the longest cave in the world, with a length of over 6 miles.

China has the most caves in the world, with over 100,000 known caves.

The Sarawak Chamber in Gunung Mulu National Park, Malaysia, is the largest cave chamber in the world, with a volume of over 1.6 million cubic meters.

Carlsbad Caverns National Park in New Mexico, USA, is known for its spectacular stalactites and stalagmites.

The Qumran Caves in the Judean Desert, Israel, are home to the Dead Sea Scrolls, a collection of ancient Jewish religious texts.

The Lascaux Caves in France are known for their ancient cave paintings, which date back to the Paleolithic era.

Bracken Cave in Texas, USA, is home to the largest colony of bats in the world, with over 20 million bats.

The Puerto Princesa Subterranean River National Park in the Philippines is known for its underground river, which is over 8 kilometers long.

The Cueva de los Cristales in Naica, Mexico, is home to the largest crystal in the world, which is over 11 meters long and weighs over 55 tons.

The Jaskinia Niedźwiedzia in Poland is known for its unique helictite formations, which are twisted and contorted calcite crystals.

The Zhoukoudian Cave in China is home to the oldest known human remains, which date back to over 200,000 years ago.

The Actun Tunichil Muknal in Belize is known for its ancient Mayan ruins, which include pottery, jewelry, and human remains.

The Shuanglong Cave in China is home to the largest underground lake in the world, which is over 2 kilometers long and 150 meters deep.

The Cueva de los Cristales in Naica, Mexico, is known for its unique gypsum crystal formations, which are some of the largest and most transparent in the world.

The Cueva de los Cristales in Naica, Mexico, is home to the largest stalagmite in the world, which is over 11 meters tall and weighs over 100 tons.