The Teide Observatory (Observatorio del Teide) is the location of several solar and nocturnal telescopes and is one of the largest observatories in the world. Located on Mount Teide in Tenerife, its altitude of 7841 feet (2390 meters) helps its scopes get clear views of the sky. You can visit the observatory on a guided tour, with different providers offering a variety of itineraries for different prices.