Historic Hull Street was actually the first street with a proper name in the Boston area.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Narrowest house in Boston.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Cryptic messages embedded in the New York City sidewalk.

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

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

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.

Bowl in splendor, if you're lucky.

This semi-hidden Manhattan restaurant is based out of a loading dock.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

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

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

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