This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Drink wine handed out through a window as part of an age-old tradition.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The largest and most famous wax anatomical collection anywhere in the world.

The middle finger of modernity.

Sculptures, jams, and the wild west collide at this folksy retreat.

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

A museum which takes visitors to the côté obscure of Paris.

The Sun King's military models, saved from the Louvre.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This Parisian café sticks almost exclusively to an ethos of reuse.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

France's national museum of scientific and industrial instruments.

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.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Notorious artist squat renovated into legal studios.

Abandoned railway line circling the city of Paris.

This massive library holds what was once the largest book collection in the world.

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

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

A book bound in the skin of an infamous criminal, along with countless other specimens.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 140-year-old castle with underground caves hidden in San Francisco.