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

New York City's smallest piece of private property.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

Narrowest house in Boston.

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

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

A legendary speakeasy bookstore returns from the brink.

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

From scholastic to sepulchral - now under reconstruction.

A dilapidated dock tells the story of Titanic's missed arrival.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Tucked in the back of this amazing antique store is an important piece of medical history.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A terrific purveyor of natural history objects and curios.