The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

Saintly bones pressed into a wax effigy of a Catholic superstar.

This little-known relic crypt holds stolen parts of a Roman Empress.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

The largest medical and anatomical collection in France lies hidden from the public.

A unrivaled and rather horrifying collection of wax dermatological models.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

A surrealist timepiece by the artist of melting clocks.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

A haunting collection of the vanished and disappearing natural world.

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

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.

Stay in the one time home to one of Scotland's most notorious gentleman's sex clubs.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

The only fixed chain and post trail in Scotland snakes its way along the base of a towering seaside cliff.

A cross marks the spot in a small Scottish village that claims to be the exact center of the country.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

A close look reveals that the Scottish monument is just slightly off-kilter.

This beach runway is off limits during high tide.