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

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

The real-life site of Ichabod Crane's infamous gourd attack.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Unrepaired walls from a 1920 anarchist bomb attack.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The most confusing clock in New York.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

An unrealized dream to wirelessly electrify the entire Earth.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

The first commercial nuclear power plant constructed on Long Island.

The final resting place of President Chester A. Arthur and hundreds of others from Revolutionary War soldiers to poets, politicians, and painters.

100 massive sculptures in the Hudson River Valley.

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

The lost town of Neversink, sunk by New York City.

Now the final resting place of prominent artists and musicians, it was originally founded to separate the rich from the poor in death.

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

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.