The final resting place of soldiers' loyal canine companions.

Breathtaking and huge 430 year old maps of Italy.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A haunting collection of the vanished and disappearing natural world.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Northern Ireland's Brobdingnagian stepping stones.

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

A six-ton wedding present for the King of the Scots.

These tiny effigies are believed to represent victims of Edinburgh’s notorious Anatomy Murders.

Bouncing, delightful, mechanical art at the MIT Museum.

This aging storage facility is the world's largest brick warehouse.

A living time capsule of the 1960s Richardson Bay water-front.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

San Francisco's newly reopened hands-on science museum.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Ruins of a German castle on top of a towering stone pillar.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Catacombs turned marketplace.

Scattered throughout London are ancient remnants of the city's former bounding wall.