A musical instrument played by the sea.

Occult books, tarot, oddities.

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

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A church of bones, decorated with 40,000 human skeletons.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Cows on a ranch are commonplace, scattered cow bones everywhere? Not so much.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

A beautiful geyser under environmental threat.

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

The most alien-looking place on Earth.

Tubing through a cave lit with glowworms is a magical underground experience.

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

An isolated dive site teeming with cnidarians.

A small town hallucinates en masse - Bad bread, or CIA science project?

Venice's "Island of the Mad."

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

This floating cinema brings new meaning to the phrase "going out" to the movies.

This deceptively salty lake looks like blushing pink lemonade.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.