The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

A mysterious statue of a leather jacket-clad rebel leans coolly on an odd yellow clock.

One of the only single-person private gravesites in New York City.

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

The greatest real estate coup of all time.

Hidden behind a gate in Greenwich Village is a little farmhouse that once served as the writing studio of a bestselling author.

A prized globe signed by Amelia Earhart and Charles Lindbergh sits in the Brooklyn office of the American Geographical Society.

A burial ground of rusting metal grave markers.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This translucent sculpture represents a quintessential component of New York City's skyline.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

A reminder to choose water over wine since 1888.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

The home of aviation trailblazers, in a remote corner of the big city.

The oldest living organism in New York City. Maybe.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

An 1883 schoolhouse now home to collective of artists.

Brooklyn's Barkaloo Cemetery is the resting place of a scant two bodies.

A young woman's senseless murder led to the controversial psychological theory of the "bystander effect."

This slender three-story building has also had several famous residents.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.