Though its celestial ceiling is impressive, the true star is the vast collection of French books.

Peek through the gates at this oasis from the city, full of Old English charm.

The loneliest island in New York.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

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.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

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

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

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

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

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

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

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

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

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A celebration of capitalism in Midtown.