A whimsical bridge adorned with decorative dragons.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

This abandoned Slovenian military barracks has become a punky-political art squat.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This massive blockhead sculpture hides an entire library.

This mountain trail inspired Nietzsche to complete his magnum opus.

A medieval military street hidden beneath a charming French fishing village.

Come to this Polish museum to take a good, clean look at filth.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A 20th-century picture show in 3-D.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

This striking sculpture of Icarus honors Greece's fallen flyers.

Legend says this sacred tree was a gift from goddess Athena.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

A sharp sculpture made of thousands of pieces of jagged glass.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.