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

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.

Visit the monolithic tomb of America's most famous general.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Hiroshima survivor on Riverside Drive.

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

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

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

The tiniest little stage in New York.

Nature and beauty amidst pollution and industrial wreckage.

Plot your trip through the city on the sidewalk.

This former crime corner has been turned into an eclectic community center.

Once a dumping spot, now a park with a kayak launch.

Tucked in the back of this amazing antique store is an important piece of medical history.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Wine bottle sculpture with a ship's stateroom inside.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

New York City's only preserved family home from the 19th century.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

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