Question 2 of 21

This state is home to Mammoth Cave, which at more than 390 miles (628 kilometers) is the longest-known cave in the world.

... Mammoth Cave is one of Kentucky's top tourist attractions. More than 2 million visitors explore Mammoth Cave National Park each year, and about 500,000 take part in a tour of the cave.

Question 3 of 21

What are the Lascaux Caves in France best known for?

... In 1940, explorers discovered a series of cave paintings in the Lascaux Caves in southwest France. While cave art can be found throughout the region, the Lascaux paintings are unusually complex, and date back more than 20,000 years.

Question 4 of 21

In 1905, two children chasing a lost cricket ball stumbled upon the Crystal Caves in this island nation.

... Bermuda's Crystal Caves are a major tourist draw. In addition to sparkling crystals, the cave system is also home to the clear blue Cahow Lake.

Question 5 of 21

Where is the deepest cave on Earth located?

... At 6,822 feet (2,080 meters), Georgia's Krubera Cave is the deepest-known cave in the world. It extends more than 1,000 feet further into the Earth than the second deepest cave, Lamprechtsofen in Austria.

Question 6 of 21

Eisriesenwelt in Austria's Hochkogel Mountain is the world's largest example of this.

... Eisriesenwelt, which is German for "Land of the Ice Giants," extends 26.1 miles (42 kilometers) into the mountains of Austria, making it the largest-known ice cave in the world.

Question 7 of 21

How long does it take the average cave to grow wide enough for a human to fit inside?

... It takes solutional caves, which are formed as groundwater interacts with carbon in the atmosphere and dissolves buried rock, more than 100,000 years to grow large enough to accommodate a human.

Question 8 of 21

What U.S cave system is home to the "Big Room," an 8.2-acre (33,184-square meter) chamber that's among the largest cave chambers in the country?

... New Mexico's Carlsbad Caverns is home to the Big Room.

Question 9 of 21

What is the name of the various dripstone features that make up a cave?

... While stalactites and stalagmites are the most famous types of speleothems, they're not the only ones you'll find in a cave. Twisted or spiraled shapes are called helictites, while small clusters of knobs are known as cave coral.

Question 10 of 21

What is the most common type of cave in the found in terms of how the cave is formed?

... Solutional caves, which form as groundwater breaks down limestone and gypsum, are the most common caves in the world. Most of the world's largest caves fall into this category.

Question 11 of 21

Fact or fiction: The oldest cave paintings in the world date back almost 100,000 years.

... Fiction: The oldest cave paintings date back a little more than 30,000 years. While cave art in Spain may be more than 40,000 years old, some scientists doubt it was made by modern Homo sapiens. Some suggest that this earliest art, which consists of pigments used to create the outline of human hands on cave walls, was actually created by our now-extinct ancient relatives.

Question 12 of 21

You can find caves in every U.S. state except for these two.

... There are caves in every U.S. state except for Louisiana and Rhode Island. The U.S. is home to more than 17,000 caves in total, 45 of which are in national or state parks.

Question 13 of 21

Fact or fiction: Ancient cave bears were so large that people in the Middle Ages who found their skulls were convinced they had once belonged to dragons.

... Fact: The cave bear evolved around 100,000 years ago, and weighed 50 percent more than the modern grizzly. People who found their skulls in caves were convinced that the bones had belonged to dragons. The cave bear died off around 25,000 years ago.

Question 14 of 21

The longest undersea cave system in the world is located off the coast of this country.

... The Sistema Sac Actun and the Sistema Ox Bel Ha frequently trade the title of the largest and second-largest underwater caves. Both of these massive undersea caverns sit off the coast of Tulum, Mexico.

Question 15 of 21

What incredible feature is New Zealand's Waitomo Cave known for?

... Waitomo Cave is home to thousands of glowworms, which dangle from the ceiling, making it sparkle like stars in the night sky.

Question 16 of 21

This Asian nation is home to the world's largest cave system by volume.

... Visitors to Malaysia can explore the Clearwater Cave System, which is believed to be the world's largest cave system by volume.

Question 17 of 21

Fact or fiction: During the Nazi occupation of the Ukraine, two local families lived in a cave for almost two years to avoid capture.

... Fact: From 1942 to 1944, two Jewish families in the Ukraine took shelter in a cave known as Priest's Grotto. They managed to avoid the Nazis and left the cave in 1944. Their story didn't make headlines until 2003, when people exploring the cave found evidence of their stay and made it their mission to seek out the survivors.

Question 18 of 21

Which country is home to the world's oldest-known caves?

... The Jenolan Caves in Australia date back a staggering 340 million years. To put that number in perspective, consider this: Dinosaurs became extinct a mere 65 million years ago.

Question 19 of 21

In 2000, miners discovered a cave filled with giant crystals in this country.

... In 2000, silver miners stumbled upon Mexico's Cave of Crystals. A combination of hot temperatures and mineral-rich waters allow crystals to grow up to 36 feet (11 meters) in length within the cave.

Question 20 of 21

Fact or fiction: More than 30 million people in China still live in caves as of 2012.

... Fact: More than 30 million people in China call caves home as of 2012. Some of these caves are technologically unadorned, while others are equipped with electricity and running water.

Question 21 of 21

What country is home to the Mogao Caves, or Caves of a Thousand Buddhas?

... From the 4th to the 14th century A.D., travelers along the Silk Road used the Mogao Caves in China to store Buddhist texts and art. Today, this network of nearly 500 caves is prized for its collection of cave paintings and sculptures. In 1990, explorers found a large hidden cache of Buddhist texts in a space now known as "Library Cave."

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