You can soak in three relaxing pools filled daily by the tide.

A series of well-preserved ruins show the culture of the ancient Benehoaritas people.

A rocky face gazes out over an enormous volcanic crater.

Indigenous cultures believed all life would end if this enormous rock toppled.

Tour the inside of a massive lava tube formed during a 1949 volcanic eruption.

The largest salt farm in the Canary Islands is located at the foot of an active volcano.

What many consider the original prime meridian and westernmost point of the old world.

An open-air museum showing how people on El Hierro lived from the time of the first settlers until the late 20th century.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

A large collection of solar and night-time telescopes dot a small area on the Teide mountain range.

A space-grade telescope mirror lies discarded in the shrubs.

An unexpected ghost village lurks on the southeast coast of Tenerife.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

Nature puts on a spectacular show at this blowhole on the eastern side of Gran Canaria.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

Where commuters walk through remnants of an ancient Greek necropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.