The volcano and its surroundings comprise Teide National Park, which has an area of and was named a World Heritage Site by UNESCO on June 28, 2007. Teide is the most visited natural wonder of Spain, the most visited national park in Spain and Europe and - by 2015 - the eighth most visited in the world, with some 3 million visitors yearly. In 2016, it was visited by 4,079,823 visitors and tourists, reaching a historical record. Teide Observatory, a major international astronomical observatory, is located on the slopes of the mountain.