Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

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

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

Plot your trip through the city on the sidewalk.

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

Cryptic messages embedded in the New York City sidewalk.

A whimsical, but often overlooked clock in Park Avenue.

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

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

New York's oldest magic store.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

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

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