It's 2 billion years old!

The atmospheric road was never meant to be so creepy.

Northern Ireland's Brobdingnagian stepping stones.

An abused and forgotten metropolis, abandoned for centuries.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

A tree grown from astronaut seeds which were exposed to cosmic rays.

One of Europe's largest supercomputers is housed inside of a disused chapel.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

This Scottish bridge seems to compel dogs to leap to their death.

A 200-year-old prison that now houses a peculiar crime museum.

The largest earthwork effigy in the world.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

A giant portrait of an ancient king looms over the river.

A blooming house of worship for the masses.

An ancient iron pillar in Delhi that seems to be rustproof.

Centuries-old bridges grown from tangled roots.

Bizarre dirt trail winds a narrow path above the tree line.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

Myanmar's Mount Olympus atop a 2,500-foot volcanic plug.

Germany has its very own Centralia, whose spark remains attributed to "spontaneous combustion."

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

An unusual cave filled with rare alien-looking aragonite formations.

A spiral staircase twists to the top of this unusual Czech lookout tower.