This miniature take on the Kremlin is one Dutch man's retirement project.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This stone complex marks the urban center of a lost civilization.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Every president in history is immortalized in bronze in downtown Rapid City.

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

Grandpa Rainbow felt the neighborhood needed some color, so he picked up a paintbrush and went to work.

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

Decommissioned NYC subway cars are dumped into the ocean to create this underwater wildlife habitat.

This former boomtown "island" is now submerged below Folsom Lake.

Dentist's hated concrete colossi are now beloved icons of the community.

The ruins of the castle that chemicals built.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Millions of dollars worth of sculpture decorate this Iowa city center.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Once the largest winery in the world, this castle-like building now sits abandoned on the San Pablo/San Francisco Bay shore.

A pier that used to act as a busy ferry dock is now a decaying favorite of local fisherman and urban artists.

What can compare to the comforting sound of 10,000 toilets running?

This folk art dinosaur was almost pushed to extinction due to lack of a building permit.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

The world's smallest drawbridge.

Abandoned Air Force base that has fallen into disrepair.

Open-air museum with an elaborate sculpture garden, stretching for over 70,000 square-meters.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.