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

A very classy 1920s-era bar right in Grand Central Station.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

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

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

A semi-scholarly approach to sex.

A crumbling hospital from the 1850s on Roosevelt Island.

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