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

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

A hotel and restaurant serving as the mecca of kitsch.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

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

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

Try not to get slimed in Tribeca.

The seamy, underground secrets of Portland's criminal past.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

An Australian lake whose pink hue defies scientific explanation.

A trash dump made beautiful by nature's power.

The long underground cave's curiously shaped stalagmites have inspired many legends.

Home to what locals claim is the largest whale skeleton in Southeast Asia, which is worshiped yearly.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

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

Lemon Grove, California is known for its giant lemon...and mummified bodies.

Where the leftovers of love affairs can live on forever.

This beautiful ridge-top trail is dotted by tiny homes apparently built by a group of itinerant fairies.

The site of murders and Satanic cult gatherings.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.