The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

A plaque marks the spot on the bridge where one of the first elephants in the U.S., Little Bet, was gunned down.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

One man is on a singular quest to name an island after a famous hip-hop artist.

Etchings in a pile of boulders on the Long Island Sound are a monument to vanquished native peoples.

The Connecticut village named for its subterranean thunder.

A mysterious air force base built to resemble a Long Island fishing village.

Ruins of a historic medical facility sits eerily by the water.

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

The kind of mixed-up place that drives archaeologists crazy.

Underground tunnels remain beneath this abandoned mental asylum.

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

To avoid the demolition costs this abandoned drawbridge was simply left in the up position.

Mysterious stone tower featured in many alternative histories of the New World.

This historic Rhode Island mini-cemetery features a number of headstones run through with mysterious holes.

A single light illuminates one man's overshadowed contributions to street lamp history.

The oldest still-operating tavern in the United States was once owned by a pirate.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

The world’s largest underground marble quarry is hiding in Vermont.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

The New England cabin where an infamous British occultist conducted experiments in "magick".

This sprawling 18th-century cemetery features unique and beautiful gravestones, including one shaped like a tree.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.