Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's deepest subway station is also a stunning ecological wonder.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This ancient market is often referred to as the oldest shopping mall in the world.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This demon atop the Notre-Dame de Paris looks utterly bored.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Thousands of miniature bronze sculptures have taken over this city square creating a unique art installation.

The painter of "The Scream" is laid to rest under a stoic bust of himself in the humble corner of an Oslo cemetery.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."