Underground tunnels remain beneath this abandoned mental asylum.

This museum holds a fully-functional replica of the "Turtle," the first American submarine ever built.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

This stunning Connecticut mansion is actually just a one-room-deep hoax.

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

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

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

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

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

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

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

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

The "possessed" house that inspired "The Haunting in Connecticut" book and movie.

The Connecticut village named for its subterranean thunder.

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

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

This petite park lets visitors see and touch examples of fossilized dinosaur tracks.

These etchings reveal the history of a long-gone quarantine site.

A former copper mine which became a truly unsuccessful prison.

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