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

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Unrepaired walls from a 1920 anarchist bomb attack.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

A hidden "place of interment for gentlemen."

A bit of retro transportation flair preserved in the world's largest department store.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

Elevated freight railway turned wildly successful urban park.

This abandoned ironworks was once the most important military supplier in America.