High rising ancient sea ledges, deep rocky canyons, cactus, grasses and thorny shrubs - who would imagine the hidden treasures deep beneath this rugged landscape? Secretly tucked below the desert terrain are more than 119 known caves formed when sulfuric acid dissolved the surrounding limestone. Your visit to Carlsbad Caverns National park may include self-guided walks through the cave, guided walks, backcountry hikes, birding at Rattlesnake Springs and nature trail hikes. You will have the opportunity to take a self-guided walk through the natural entrance and the Big Room. To see the Scenic Rooms (King's Palace, Queen's Chamber) you will need to get on one of the guided tours available. Other guided tour options include Left Hand Tunnel, Lower Cave, Spider Cave, Hall of White Giant and Slaughter Canyon Cave. All visitors to the park are encouraged to tour the main section of the cave, the Big Room self-guided tour. The Natural Entrance self-guided tour is also very impressive, but it is not recommended for visitors with any kind of health problems because it is very steep. While there are a variety of cave tours available-from the self-guided areas of the Big Room to crawling through narrow passageways on the Hall of the White Giant Tour - there are also opportunities for hiking and backcountry camping, attending programs in the Visitor Center to watching the incredible exodus of Mexican Free-tailed bats out of Carlsbad Cavern at dusk in the summer.