Underground tunnels remain beneath this abandoned mental asylum.

Connecticut's shot tower is near the end of its life.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

This enormous abandoned factory is now a makeshift graffiti gallery.

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

The remnants of a 19th-century ironmaking complex hidden in the woods of Connecticut.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

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

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

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

Amazing views of Long Island Sound can be seen from this mountaintop tower.

Who knew the Devil's domain was a hot spot for tubing?

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

An abandoned 146-acre summer resort slowly being reclaimed by nature.

An abandoned Depression-era zoo hidden just off the highway.

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

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

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

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

Inside a state forest, the forgotten remains of a Cold War defensive installation.

A fire station-turned-church-turned-museum dedicated to the work of seminal light artist Dan Flavin.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.