An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

A wondrous old library overlooking the nation's capital.

One man's ambition created this psychedelic log home.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

A ghost town at the airport is now a refuge for blue butterflies.

The remains of the first punk club in L.A.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A castle built by an eccentric medieval enthusiast in rural Ohio.

A house carved into a rock in the 1940s.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This free, take-a-book shop seems like a trick but isn't.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

When ecosystems collide in the arid Southwest.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.