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

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

A long abandoned hospital building on the outskirts of NYC.

This mouldering abandoned mental hospital was once a center for progressive healing.

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

Underground tunnels remain beneath this abandoned mental asylum.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

No one really knows how these old hobby horses got here, but the herd keeps growing.

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

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

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

An elaborate, hidden model train in the Needham Town Forest.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

A historic bridge with a lovely acoustic anomaly.

A beautiful Victorian-era cemetery, complete with a miniature village.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

An overgrown and abandoned tuberculosis ward resides in the midst of a quaint modern neighborhood.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

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.