El Teide is the highest mountain in Spain (3718 meters). This is actually a volcano on Tenerife in the Canary Islands. The Teide National Park that covers the mountain too is a World Heritage Site of UNESCO since 2007. This is one of the most popular national parks in the world. This is definitely the most visited natural attraction in Spain. Besides the rich flora and fauna, El Teide is known for the excellent spots that can serve people who want to observe the stars. That’s why the famous Teide Observatories were formed.