A market built atop boats is one of the few floating holiday markets in Europe.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Sweden's "good old days" painstakingly re-created in a model village.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

One part local history, 99 parts gruesome haunted house.

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

A surrealist timepiece by the artist of melting clocks.

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

A haunting collection of the vanished and disappearing natural world.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

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

Abandoned railway line circling the city of Paris.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Notorious artist squat renovated into legal studios.