The Tsodilo Hills are a UNESCO World Heritage Site (WHS), consisting of rock art, rock shelters, depressions, and caves. It gained its WHS listing in 2001 because of its unique religious and spiritual significance to local peoples, as well as its unique record of human settlement over many millennia. UNESCO estimates that there are over 4500 rock paintings at the site. The site consists of a few main hills known as the Child Hill, the Female Hill, and the Male Hill. These hills are of great cultural and spiritual significance to the San People of the Kalahari.