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

The most confusing clock in New York.

Rummage through this sunken ship, but leave your scuba gear at home.

Commemorating the spot where the famous scientist fed his pigeons.

Cryptic messages embedded in the New York City sidewalk.

Historical figures from New York City's Catholic community reside in Midtown.

Visit the monolithic tomb of America's most famous general.

Plot your trip through the city on the sidewalk.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

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

This abandoned subway station can still be seen on regular commuter trips.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

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

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

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

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

Nikola Tesla's former home contains an homage hidden from plain sight.

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

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

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

More gold than anywhere else, ever.