France's most famous cemetery, with some of its most curious tombs.

This research center for rare prosimians is studying how they sleep to help prolong human life.

The first custom-designed building to showcase the works of Dale Chihuly is a wonderland of glass and light.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

This picturesque ghost town is located on the banks of the Suwannee River.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

An old, deep well, connected with a miraculous, divine rescue and the patron saint of Madrid.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

The current seat of the Parliament of Andalusia was once the epicenter of the Great Plague of Seville.

Medieval ruins nestled within a breathtaking swath of Spanish nature.

Guitarist Paco de Lucía overlooks travelers as they pass through this train station dedicated to his legacy.

This beautiful spit of land was once the summer playground of the king of Spain.

According to tradition, King Phillip II supervised construction of the seat of his empire from this seat carved into rock.

A hidden medieval crypt where a famous legend says the devil used to teach black magic.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

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

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

The oldest Roman lighthouse still in use.