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

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A marvel of Byzantine engineering under the streets of Istanbul.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The middle finger of modernity.

This quirky curiosity shop takes its cues from the world's bazaars.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A mechanized clock where a man fights off a dragon, crab, and rooster.

Venice's "Island of the Mad."

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

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

Renaissance villa and gardens complete with a tormented colossus.

Peek through a transparent pyramid and drink in the mountain made of books.

A curious collection dedicated to human and animal anatomy and pathology.

The world's brightest bioluminescent bay.

Venue for strange sideshow displays and musical acts.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

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

Museum preserving torture methods from the past.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Every autumn, this hillside is ablaze with red summer cypress.

One person's lost luggage is another person's treasure.

An ethereal glowing blue ocean cave in Croatia.

Giftshop catering to cryptozoologists and anyone with a sense of humor.