A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A haunting collection of the vanished and disappearing natural world.

Abandoned railway line circling the city of Paris.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A tongue-in-cheek arcade where the games are based on everyday life.

Eighty million natural history specimens call this gargantuan museum home.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

One part local history, 99 parts gruesome haunted house.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

The attic of a four-century-old canal house hides a clandestine church.

A floating cat sanctuary on an Amsterdam canal.

A former plague hospital turned medical museum.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.