Walk into the 19th century without leaving Brooklyn.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

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

Hear the tales of New York's most notorious criminals.

This small, hidden cove is home to abandoned boats.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

New York City's only preserved family home from the 19th century.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

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

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

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

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

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Visit the monolithic tomb of America's most famous general.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

The oldest living tree in Manhattan comes shrouded in sinister legend.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.