Step inside Lucy, the world's largest "elephant."

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

The site of one of history's most indelible and horrific tragedies.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A famed data visualizer's personal sculpture garden is a landscape of modern and megalithic wonders.

Once the largest attraction in Rhode Island, this former amusement park is now a gorgeous coastal state park.

A giant green dragon crawls down from the roof of the Providence Children's Museum.

The only surviving fragment of the lost Narragansett Pier Casino.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.

The last vessel built by a submarine pioneer stands as a monument to his legacy.

A once-booming railroad left abandoned next to the Quinnipiac River marshes now intersects with a hiking trail.

An abandoned Victorian-era mill in the middle of modern Manchester.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

The cave where two British judges hid in exile after sentencing the king to death.

The world's largest indoor go-kart racetrack is hiding in Connecticut.

A former copper mine which became a truly unsuccessful prison.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

A miniature village lies nearly forgotten in the forest by the side of a major highway.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This cave was once thought to be a hiding place for the devil.

Once a kitschy symbol for a gift shop, this 38-foot seahorse is now a staple roadside attraction.