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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

A mechanized clock where a man fights off a dragon, crab, and rooster.

The oldest stone house in Paris was built by its most famous alchemist.

A lush vertical garden blooming in the heart of Paris.

Marie Antoinette and Napoleon Bonaparte were fans of this 200-year-old French chocolatier.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

This modest marker near Notre Dame identifies the very center of Paris.

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

Order a boozy baba au rhum at the oldest patisserie in Paris.

The narrowest street in Paris.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

This 400-year-old tree is actually an immigrant from North America.

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

A surrealist timepiece by the artist of melting clocks.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

Ship-sized kinetic sculptural fantasy.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

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

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.