The Teide volcano on Tenerife, one of Spain's Canary Islands, is among the new sites added to the World Heritage list.
Teide was selected because of its natural beauty and important geological history. The volcano is more than five million years old, so it provides valuable geological information about the evolution of oceanic islands.
The volcano's summit reaches to an elevation of 12,188 feet (3,715 meters), making it the third largest volcano on Earth. It is toped by the Las Canadas caldera, a 7- to 12-mile-wide (12- to 20-kilometers-wide) depression created by an ancient volcanic eruption.