The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

The people murdered during a 17th-century Norwegian witch hunt have been honored with a pair of stark, modern installations.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A modern mechanical planetary system, part of a 10,000 year clock.

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

A huge musical instrument played by the ocean.

A winding path built in secret on the edge of the continent.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

Elaborate hand-carved wooden clocks two brothers made in their spare time are on display at this handsome little museum.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

Water of undetermined depth has attracted rare fish and cult leaders alike.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Marta Becket's hand-painted theater in the desert.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.