A sculpture serving as an homage to Pope John Paul II.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Water and windows define this defensive Italian well.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

The fairy tale castle of the "fairy-tale king."

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

This automated sculpture of two men peeing will spell out text messages with their micturition.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

Where royalty waits in the height of luxury.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Lady Liberty's original designer installed a little clone in this French fountain.

The world's largest reflecting pool is just two centimeters deep.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The eclectic observatory castle of a 19th-century astronomer and explorer.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This 19th-century fountain's namesake animal isn't what you think it is.

Giant topiary dog once played a role in a terrorist bomb plot.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A pair of gigantic baby heads greet passengers at Atocha Station.