An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Established in 1937, the oldest candy shop in New York City boasts a rainbow-colored inventory that would make Willy Wonka envious.

A seemingly out-of-place comic book surprise sits on the 21st floor of the tallest university library in the world. 

A series of murals depict the evolution of plant life from the Precambrian to the modern day.

This hollow steel globe is the second-largest in the world.

A giant concrete churn carries the legacy of American resilience, unity, and greed.

This woodland architectural installation acts as a camera obscura for the heavens.

This family-owned diner has been slinging chili dogs since 1940.

A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.

This fallen red oak tree has been transformed into a piece of trailside art.

The largest collection of historic military firearms in the United States.

Money may not grow on trees, but it can be dispensed by one.

This massive boulder is inscribed with the story of a sensational hostage negotiation dating back to Colonial times.

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

Between 1930 and 1946, a tobacco farmer laid his beloved horses and mules to rest in this small patch of pine forest.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Designed as a place for patients to take in the scenery, this tower has a dark history.

This diesel train serviced the Brooklyn waterfront for more than three decades.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The home of an antique carousel still in operation.

This exhibit is devoted to the games and wonder that Hasbro has brought children worldwide.

One was an astronomer who spent his life chasing solar eclipses, the other helped make Emily Dickinson famous.