This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

A dilapidated dock tells the story of Titanic's missed arrival.

Walk into the 19th century without leaving Brooklyn.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

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

The walls of this medieval church are covered with perfectly preserved frescos, including a pristine example of the Dance of Death.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

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

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

Strange rumors surround the artist who created these solemn metal guard dogs.

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

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

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

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

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