World's Biggest Cave Found in Vietnam

At 262-by-262 feet (80-by-80 meters) in most places, the Son Doong cave beats out the previous world-record holder, Deer Cave in the Malaysian section of the island of Borneo.

Lechuguilla Cave - 125 miles long - Planet Earth - Caves

Exploration history

Lechuguilla Cave was known until 1986 as a small, fairly insignificant historic site in the park's backcountry. Small amounts of bat guano were mined from the entrance passages for a year under a mining claim filed in 1914. The historic cave contained a 90 feet (27 m) entrance pit known as Misery Hole, which led to 400 feet (122 m) of dry dead-end passages.

Cave

Easier - A cave is a large hole. It may be underground, in the side of a hill or mountain, or under a cliff. A cavern is a large cave.

Caves are natural shelters. Animals often live in caves. A person who lives in a cave is called a cave dweller. During prehistoric times, cave dwellers painted pictures on the cave walls...