The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Elevated freight railway turned wildly successful urban park.

The fragmented remains of a massive public bath connected to the city's water supply.

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

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The final resting place of the great navigator, or maybe his brother.

A lush indoor jungle fills this bustling Madrid transportation hub.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This legendary city has been a tourist attraction for centuries.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

Ancient serpentine sacrifice holder that has stood the test of time.

This eatery re-creates dishes from the Ottoman Empire so you can dine like a sultan.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Elaborate tile work in this railway station tells the story of Portugal.