An underground chamber is a type of subterranean structure, typically found beneath the surface of the earth. Common examples of underground chambers include grottos, crypts, vaults, caverns, catacombs, caves, and kivas. Grottos are typically small, often artificial, caves used for recreation or as shrines. Crypts are usually chambers beneath church floors used for burial. Vaults are typically large, secure rooms used to store valuable items. Caverns are large, natural underground spaces, often with stalactites and stalagmites. Catacombs are underground cemeteries, often associated with ancient civilizations. Caves are natural underground spaces, often with winding passages. Kivas are underground ceremonial chambers used by Native American cultures.