A field of nothing but boulders which resembles a giant's gravel driveway.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

This park contains a number of standing stones meant to heal and inspire.

This spooky road cut through a mound of ancient coral might be haunted by a witch.

These constructed wetlands naturally filter millions of gallons of treated wastewater every day.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

Dubbed the "smallest church in America," this tiny sanctuary was a local grocer's dream come true.

An early-19th-century hotel with a past that is steeped in the Civil War.

A statue honoring 44 continuous years of greeting passing ships.

"X" marks the spot of an echo chamber in the middle of a plaza.

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

A towering bronze statue memorializes the founding father of postwar American conservatism.

A geological mystery on Camelback Mountain.

The unusual burial monument of Arizona's first governor.

The first permanent memorial to a unique secret weapon of World War II.

Once a year, at exactly 11:11 a.m., this monument comes to life.