This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A natural gas leak provides a flickering flame beneath a waterfall.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

Unique antiquarian shop specializing in globes, maps, and prints.

One of the last Jazz Age "Wonder Theaters" in New York City.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The oldest surviving synagogue in New York City is now a soaring art space.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Nondescript elevator doors open to reveal a stunning, surreal world.

New York City's smallest piece of private property.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

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

Ride the subways of yesteryear.

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

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.

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

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.

New York's oldest magic store.

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

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

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

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