The Cumuy Caves is the larest cave system in the world and the largest in the western hemesphere.
the largest caves are found under the Atlantic Ocean
in Papua New Guinea, which is one of the largest cavesystems in the world
The Mammoth Cave system, located in Kentucky, is the largest cave in the world.
Russia has the most caves. It has 19% of its total area covered by carbonate rocks at the surface, which are the primary constituents of caves.
The top five largest caves in the U.S. include Mammoth Cave in Kentucky, which is the longest cave system in the world, followed by Sistema Ox Bel Ha in Florida, which is one of the longest underwater cave systems. The third largest is Jewel Cave in South Dakota, known for its beautiful calcite crystals. Other notable large caves are Wind Cave, also in South Dakota, and Lehman Caves in Nevada.
World's largest ice cave presently known is in Austria: the Eisriesenwelt. It's a normal limestone cave with >42km of known passages, many richly decorated with lovely ice layers and formations. Show-cave in parts.
People want to see the cave and the bats. Carlsbad Caverns is one of the largest caves in the whole world!
Mammoth cave in Kentucky is big in fact the biggest cave in the world! (By total surveyed length.)
Definitely no! The largest cave in Europe in length are the Hölloch in Switzerland and the Optymistychna in Ukraine, or in depth it is the Krubera-Voronja Cave in Georgia ( is this really Europe ?), also two caves in Spain, two in France, and one in Austria. For more infos look at http://www.wisegeek.com/what-are-the-largest-caves-in-the-world.htm
The Flint Ridge - Mammoth Cave system (USA) is the world's longest by total of passage lengths. Sarawak Chamber, in, I think Deer Cave but I may be wrong, (in Sarawak anyway!) is the world's largest known chamber by volume. The word's deepest cave is in the Ukraine but I can't give its name without a lot of searching, I'm afraid.
Carlsbad Cavern in New Mexico has more than 100 caves. A large cave named "The Big Room" is almost 4,000 feet long, 625 feet wide, and 255 feet high at the highest point. It is the fifth largest chamber in North America and the twenty-eighth largest in the world.