Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

The world's largest wooden structure.

Legend has it the lovelorn tears of a princess and a shepherd boy formed the blue and green twin lakes in the Azores archipelago.

Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

These unique "earth pyramid" clay columns can be found in ravines around the village of Tirolo.

High in the Italian Alps, a lonely chapel with a striking view of the Matterhorn.

Medieval torture techniques with a modern conscience.

Windblown rock formations in an ancient Roman quarry.

Mysterious tombstones thought to be remnants of Atlantis.

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

This weird, elephant-shaped rock also hosts two ancient tombs.

Ancient cave tombs known as the "houses of fairies."

Once one of the largest sites of silver deposits in Italy.

A plaque on the base of this statue holds a bewitching design.

The first passenger cable car in the world.

A strange-looking 18th-century tower sits on a tiny islet just off Livorno.

A former mining village that now operates as an open-air museum.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

A freedman baker’s lavish tomb has a relief showing various stages of Roman bread making.

A small but very fascinating fountain in the center of Rome with four books and a deer carved.