The last standing puppet theater on Long Island.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

A former connection to City Island, it has been abandoned since the 1930s.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

A wunderkammer hidden on the top floor of the Hartford statehouse.

An abandoned gun-funded 19th century utopia.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

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

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

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

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

The intriguing personal collection of a professional demon-chaser.

Mansion and shopping center used in the 1975 film "The Stepford Wives."

A parade of antique steeds offers a quirky ride through history.

A once grand hotel is being retaken by the wilderness it once capitalized on.

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

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

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

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.