The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

This small chapel is built of human bones and decorated with a golden skeleton.

A giant Troll lurks under one of Seattle's oldest bridges.

Various forms of phallic art decorate this hill in commemoration of legendary local tragedy.

The original goat tower, the one that started it all.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

The largest stone moai on Rapa Nui.

A 30-acre garden inspired by the principles of modern physics.

Playable, historic pinball machines fill this Alameda museum.

A Victorian mansion, painstakingly reproduced to appear just as the the Munster's family home did on TV.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A comprehensive collection of Pez dispensers.

The ghostly remains of an accidental sea.

A beautiful but toxic fountain of mercury.

America's most famous piece of self-built architecture.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

150-year-old satirical tableaus made from stuffed frogs.

Deep in the Thar desert, a temple crawling with thousands of holy rats.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Of course Salvador Dalí lived in a castle...