These unusual rooms on wheels are holdovers from the 1960s.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

What is the Thing?

Public works and national defense project meant to carve a canal all the way across the state of Florida.

Legend says train robbers stashed their gold within the depths of this unusual cave.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

At 207 feet, one of the world's longest continuous escalators.

This Chinese-style quartz sundial was saved in its final hour.

FDR's Art Deco hospital tower was hopelessly inefficient.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The romance of early commercial flight still fills this Art Deco destination.

One of the world's largest tanks mimics the experience of watching rare whale sharks, giant rays, and deep sea creatures from the ocean floor.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

A prison-like structure guards the remains of a notorious Old West outlaw.

Located within a historic park, the beacon is the oldest standing structure in Miami.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

This is one really big nut.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.