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

Nondescript elevator doors open to reveal a stunning, surreal world.

A simple midtown bar was once the home of a secretive and exclusive club staffed by "bunnies" under Hefner's strict rules.

The best B-movies filmed on a shoestring budget were born here.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

This Bronx apartment building is officially recognized as the birthplace of hip-hop.

The famous author's cottage hideaway.

The only remaining piece of hull of the most decorated US ship of WWII is this giant name plate.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This forlorn park is the result of a failed investment turned tax dodge.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

The first pet cemetery in the United States.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

A gazebo that inspired the fifth episode of the "Twilight Zone" still stands in the creator's hometown

A memorial to the 1913 tragedy that helped protect the workers of the future.

An abandoned asylum where patients have been forgotten but their possessions remain.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

This research center for rare prosimians is studying how they sleep to help prolong human life.

An abandoned 1920s school with a mysterious history.

The only building in Louisville (hopefully) that contains two ancient holy skeletons.

A life-sized memorial to Harry L. Collins, the official corporate magician of Frito-Lay.