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.

This sculpture encompasses the emotion of rail travel.

A recreation of a sign that Charles Dickens used to see on his walk home.

The world's longest continuously running show has played at this small West End theater since 1974.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.