The maritime museum that boasts the largest nautical library in the western hemisphere.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The resting place of a Civil War celebrity's amputated limb.

A chapel built by Italian POWs during World War II tells a forgotten tale of the war on the home front.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

The world's longest known cave system.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The history of whiskey and all of its boozy glory, from Colonial days to modern American cocktail culture.

This huge clock made of flowers and simple machinery was once used a political weapon.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

Unique tower has outlasted a takeover of the company.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Commemorating the spot where the famous scientist fed his pigeons.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Slyly buy a shake in the Parker Meridien lobby.

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

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

Unrepaired walls from a 1920 anarchist bomb attack.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.