Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A hundred copies of Antony Gormley's naked body stare out across the water.

The oldest Roman lighthouse still in use.

Loyal fans of one television's most famous painters still come to pay their respects.

Rippling sand dunes frozen in the Arizona rock.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The remains of what was, not so long ago, the world's largest city.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

Just a man taking his prehistoric pet for a stroll.

This mesmerizingly colorful pond looks like a scene straight out of a fairytale.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The birthplace of the very first human resident born in Antarctica.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

The remote graves mark the mysterious deaths of four 19th century explorers.

A walkable map of the world, made from soil and stone by one man.

Come in, light some incense, and ignore the live snakes around you.

Flaming barrels of tar race through these village streets on Bonfire Night, a tradition that dates back centuries.

Looking like nothing more than a cartoon deserted island, this tiny sandbar is home only to a single umbrella.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.