This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

A castle built for love, and abandoned due to heartbreak.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

The site of a tragic massacre that spawned a multimedia franchise.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

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

Once America's longest-manned military fort, now an abandoned hulk.

The famous author's cottage hideaway.

A natural gas leak provides a flickering flame beneath a waterfall.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

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

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

An abandoned castle owned and ignored by Masons carries a cursed history.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A very classy 1920s-era bar right in Grand Central Station.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.