A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

The first green space constructed on an elevated viaduct.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This historic Chinese tower was said to have been haunted by fox spirits but is now haunted by a grisly murder.

This ancient Chinese observatory still contains early astronomy technology.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

Ming Dynasty necropolis raided during the Cultural Revolution.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Beijing's version of Disneyland, completely abandoned, mostly destroyed.

60 feet of towering steel balances gracefully.

A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

Pizza joint known for labor-inducing salad dressing.