An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

An accidentally hidden library containing the ephemeral history of New York.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

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

This abandoned subway station can still be seen on regular commuter trips.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

This semi-hidden Manhattan restaurant is based out of a loading dock.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The snowbirds here are circus sideshow performers.

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

This lake-bound geographical marker sits at the point where three European countries intersect.

Adherence to strict Jewish laws is required to enter this ultra-conservative New York village.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

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

This forlorn park is the result of a failed investment turned tax dodge.

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

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.