Commemorating the spot where the famous scientist fed his pigeons.

The world's largest public collection of PEZ memorabilia.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Even Henry David Thoreau found this glacial pothole irresistible.

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

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

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

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

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.

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

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

A popular European tradition makes its way to the states on one of America's most famous bridges.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Try not to get slimed in Tribeca.