Welded sphere dropped from space.

Bizarre living fossil only grows in a small chunk of the Namib Desert.

Held in a fort that once stood for colonization of the area, this museum now tells the history of its indigenous people.

In Namibia there is an installation that explores the intertwined linguistics and existential beliefs of an imaginary community.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

The remains of diamond fever taken over by the desert.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

This modern arts center is built around a gem of late-Baroque architecture.

What was once the largest NFL stadium.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Stroll through a wonderland of stupendous moss-covered trees.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

Steep canyon walls hide a forested oasis in the West Texas desert.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

When this test site was abandoned, they didn't even bother to take the rocket with them.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

An unrealized dream to wirelessly electrify the entire Earth.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A reproduction of earth's many biomes.

Former island in the Aral Sea used to be a top-secret Russian bio-weapons facility.

An abandoned NSA listening post on Berlin's "Devil's Mountain."