A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A diverse collection of wax, bone, papier-maché and mummified relics.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

Caves famous for the dragon-slaying saint who lived there.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Gods clash with machines in a power plant regenerated as a museum.

2300-year-old Roman road connecting the empire.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This is the oldest Roman-made bridge in the city still existing in its original state.

The mystic whose incorrupt corpse still attracts the faithful.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

Plaques on its facade commemorate the Tiber's most destructive deluges.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.