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

America's only nuclear missile silo open to the public.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

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

An unassuming secret door once led to a legendary watering hole.

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

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

Banksy gives themself artistic license with this piece of London street art.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A celebration of capitalism in Midtown.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

One of only two commuter aerial tramways in the United States.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Peek through the gates at this oasis from the city, full of Old English charm.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

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