Limestone caves are natural underground formations created by the dissolution of limestone rock, primarily through the action of water. Over thousands of years, slightly acidic rainwater seeps into the ground, eroding the limestone and forming intricate passageways and chambers. These caves often feature stunning formations like stalactites and stalagmites, which are created by mineral deposits from dripping water. Many limestone caves are found in regions with abundant limestone deposits, such as the Appalachian Mountains in the United States and the Carlsbad Caverns in New Mexico. These caves provide unique ecosystems, housing various species of bats, insects, and other wildlife. They are also popular tourist attractions, offering guided tours for visitors to explore their natural beauty.