Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

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

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A sea cave with a waterfall and Viking past

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

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

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

This museum houses an imposing skeleton army comprised of creatures great and small.

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

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

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

A glacial pothole was once a hideout for a notorious Scottish outlaw.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Abandoned railway line circling the city of Paris.

One of the world's most complex timepieces.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

The oldest operating pharmacy in the world features 800-year-old recipes.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This Parisian fountain is a little bit fantasy and a little bit nightclub.