Razor-sharp limestone formations hang from the ceiling of the Tardis Cave in Borneo. It takes millions of years for these pointy stone icicles to form.
Some caves form in glaciers or on snow-covered mountains, like this ice cave on Mount Kenya, the highest mountain in Kenya. Ice caves are cold and icy all year-round, not just in winter.
This cave is in Matanuska Glacier in Alaska's Chugach Mountains. Matanuska is an active glacier, which means it still moves—about one foot (0.3 meters) every day.
A cave explorer examines the Majlis al Jinn cave in Oman to see if it is safe for tourists to enter. This cave is as deep as a 50-story building is tall. It's one of the largest caves in the world.
In 1940, a group of teenagers discovered this cave in France decorated with prehistoric artwork. Named Lascaux Cave, it contains about 600 paintings of animals. Some of these paintings are more than 17,000 years old!
A caver descends into Hytop Drop, a 98-foot-deep (30-meter-deep) pit in the Walls of Jericho, Tennessee. The large, bowl-shaped cave is nicknamed the Grand Canyon of the South.
Ancient Maya people created handprints on the walls of Handprint Cave in Belize by blowing powdered dye on the wall around their hands.
This cave pit, called Fantastic Pit, is in Ellison's Cave in Georgia. At 586 feet (179 meters) deep, it is the deepest cave pit ever discovered in the continental U.S.
A cave explorer, called a spelunker, begins a 1,234-foot (376-meter) descent into Sótano de las Golondrinas, a cave in San Luis PotosÃ, Mexico. The cave's entrance is the second deepest in the world, so the trip is dangerous even for experienced explorers.(kids.nationalgeographic.com)
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