One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

Paris' linguistic guide to the international language of, yes, love.

A museum of carnival attractions where you are invited to ride the rides.

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

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

Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

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.

These centuries old gardens have been restored to their 17th century condition.

England's foremost purveyor of funeral furniture hasn't changed a bit since the 1960s.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

This historic abandoned train station looks like a stop for ghost trains.

The footprint of a frustrated devil in Munich's Cathedral.

The designer of this railway tunnel added a birthday present for himself.

Eighteenth-century home, where Herschel discovered the planet Uranus.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

The graveyard with the highest IQ in Britain.

An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

A complicated contraption for telling time by the moon.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

A plaque marks the humble origins of an artistic muse who embodied the ideals of Pre-Raphaelite beauty.