A hidden art gallery in an abandoned Warsaw fort.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

A mysterious shape catches the eye in this 16th-century painting.

The bronze uniforms commemorate the vital role of women during World War II.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A cluttered and astounding collection of antiquities and curiosities.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Hundreds of notes give thanks to the patron saint of lost causes.

This hidden collection of everyday objects illustrates life within communist Poland.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

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

This heavily worn bas-relief was once an honored fertility symbol.

Hidden along this old street in Antwerp is a surreal monument of a bronze arm sprouting four hands.

This interactive sculpture allows visitors to leave a message in case a friend passes by.

This legendary giant, born from vegetables, terrorized townspeople and cheated local children in games.

This former guildhall with a bacon-like exterior is now home to a museum covering 600 years of Antwerp's musical history.

According to this bar, God gave an “11th commandment” to Antwerp: Thou shalt drink beer.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

This small corner bar is home to a rare 1930s dance organ that still plays tunes for one Euro.

Remnants from a time before electricity.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

Inside this Krakow church, an explosion of psychedelic color.