Castro's communist ice cream mothership has been serving five-scoop "salads" for over 50 years.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Amsterdam's former hotspot for public executions and dissections.

The world's only museum devoted to the wonders of fluorescence.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

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

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

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

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

A modern-day Lascaux cave underneath Paris.

The curious underground history of keeping Paris clean.

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

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

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.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

A subterranean shelter remains intact under a busy Paris railway station.

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

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.