Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

The hallucinogenic center of the ancient world.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The walls and streets of the ancient city are peppered with penises.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

Five candy-colored villages on the Italian Riviera.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This unassuming brick building has survived fires, storms, and more to bring entertainment to one Delaware town.

This Annapolis home was built by one of the signers of the Declaration of Independence.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This demon atop the Notre-Dame de Paris looks utterly bored.

Legend has it a commoner volunteered to be buried alive in the foundation so that the great fortress could be built.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

This 15th-century mosque is a beautiful blend of Hindu and Islamic architecture.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.