A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

A curious collection of mechanical moving figures.

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

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A massive underwater sinkhole made famous by Jacques Cousteau.

Towering basalt columns, a creation of fire and ice.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

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

Huge hole looks down onto an underground beach populated with sea lions.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

"Only the devil could play golf here."

The most alien-looking place on Earth.

Northern Ireland's Brobdingnagian stepping stones.

Mysterious rocks that ring musically when struck.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A monolithic monument in Greater London.

Museum preserving torture methods from the past.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.