The loneliest island in New York.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

Visit the site of a subway powered by nothing more than air--and lots of it.

A former connection to City Island, it has been abandoned since the 1930s.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

This grand gothic brewery has been pumping out suds for over a hundred years.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A wondrous old library overlooking the nation's capital.

An overgrown and abandoned tuberculosis ward resides in the midst of a quaint modern neighborhood.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

An unrealized dream to wirelessly electrify the entire Earth.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

The once abandoned ruins of a Victorian beachside amusement park are now back in working order.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

A celebration of capitalism in Midtown.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

A prohibition era watering hole for the police.

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

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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