Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

A hands-on traveling collection of the innovative devices of yesteryear.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

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

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

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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

A crumbling hospital from the 1850s on Roosevelt Island.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A terrific purveyor of natural history objects and curios.

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

This former POW camp was transformed into a Cold War missile installation.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The "first cat," "first dog," and even a presidential pygmy hippo all get their due in this museum.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

A glimpse into early 19th-century education.

Home to a 27 room house, this estate was crafted by Black entrepreneur Olander Banks Sr.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.