This labyrinthine resting place of Black American leaders has been reclaimed by nature.

A historic Black graveyard hidden in the parking lot of one of America's largest malls.

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

A museum and research center dedicated to preserving the history of Rolls-Royce and Bentley motorcars.

This four-story steel sphere in Maryland was used to test biological weapons.

The charming collection celebrates a small Ohio village's Finnish roots.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

A diorama of the Civil War, fought by cats.

Home of the only civilian casualty at the Battle of Gettysburg.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

This recreation of a 19th-century dime museum is full of oddities.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

Medical history museum featuring a lovely doctor's office from the 1800s.

The angel of death appears to weep black tears at this grave marker.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

A jukebox headstone marks the grave of the Cleveland disc jockey credited with coining the term “rock 'n' roll."

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

The only presidential monument to display a late POTUS's actual casket.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

Solving a 60-year mystery finally gave a name to the young woman known only by the color of her clothes.