These jagged limestone blades cut out through the canopy of the jungles of Borneo.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A library of only unpublished manuscripts.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

A regular looking rock with an unbelievable history.

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

This magical-looking island is notorious for the misfortunes suffered by its owners.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

Eco-friendly island mansion.

A 16th-century horror show built in a lovely Italian garden.

Unusual British home built to disguise a water tower.

Less a museum than a bizarre fantasy world created by artists and engineers.

Where the lovelorn find a home for their sentimental keepsakes.

Cathedral carved out of salt, located a mile below the earth's surface.

A beautiful lighthouse with as many steps as days in the year, as many windows as weeks, and as many levels as months.

What was once a unique system of urban elevators is turning into a mechanical ruin.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

A lonely beacon, precariously perched atop a remote sliver of rock.

One of the world's largest ancient burial mounds.

A hand-built folk art installation covered with messages of God's love.

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

This 16th-century monastery has been turned into a surrealist architecture compound.

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

Japanese island famous for poison gas and fluffy bunnies.