A unique seaside cave where Aleister Crowley faked his own death.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

The Voodoo Superstore of the world.

This giant statue is the product of a mixture of corruption, Stalinist architecture, and North Korean manpower.

A geological bull's-eye visible from outer space.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

The world's largest ship graveyard is the product of decades of corruption.

Ruins of a Carnegie family mansion on Cumberland Island.

This crocodile-infested Timor-Leste reservoir is also home to a spectacular half-sunken forest.

Giant marble phalluses on the sacred island of antiquity.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

A marvel of Byzantine engineering under the streets of Istanbul.

America's only nuclear missile silo open to the public.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

Unrepaired walls from a 1920 anarchist bomb attack.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A community of collapsing homes more than a mile out from the Florida coast.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Go inside to really appreciate this 500-year-old technological masterpiece.