Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Elevated freight railway turned wildly successful urban park.

This New York estate was designed to resemble a medieval Scottish castle.

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

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

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

HBO series' stage tucked away in a Greenpoint lot is the largest theatrical set of its kind in the United States.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

Sniff the Titan Arum's rotting flesh.

The famous author's cottage hideaway.

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

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

The place where Dvořák composed some of his most famous works.

Hidden behind a gate in Greenwich Village is a little farmhouse that once served as the writing studio of a bestselling author.

This Manhattan museum houses one of the largest collections of Spanish art and manuscripts outside of Spain.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

New York City's only radical feminist independent bookstore.

Those belting out show tunes might not realize this piano bar marks the site where Thomas Paine died in 1809.

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

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

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

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

A hidden "place of interment for gentlemen."