Cold storage for agricultural biodiversity.

This Arctic mining town is home to a cat that's spent years masquerading as a fox.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

A "miracle" that seems to produce more holy fistfights than holy revelations.

An ancient quarry rediscovered by a dog and claimed by biblical kings, a German cult, and the Freemasons.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

A fiery crater has been burning in the Karakum Desert since 1971.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Surreal riveted sea forts once protected the Kent shores from German attack.

An Italian hillside ghost town.

Odd outsider art installations surround a Gold Rush-era ghost town.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

The “City of Stairs” sits high in the Andes, above the world’s largest underground copper mine.

The deadliest diving spot in the world is also a stunning geological marvel.

Sited in an Inner Mongolian desert are the remnants of an important trade stop along the Silk Road.

An abandoned outdoor movie theater in the Sinai desert.

This abandoned fishing settlement may well be the greenest village in the world.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.