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

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

World's largest collection of serial killer artwork and other macabre exhibits.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

An artist's cute bronze subway sculptures belie his violent artistic past.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

The land is home to swimming ponies and a legendary 18th-century treasure.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

The trials and tribulations of marking Poe's grave.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A downtown park built on top of unclaimed graves.

An Industrial Revolution-era public work that purified water using nothing but sand.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Bizarre Cavern.