The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

An activist who committed her life to peace and women's suffrage.

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

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

A one-ton statue of Steve Rogers beautifies the entry to a Brooklyn Bed, Bath & Beyond.

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

This Manhattan museum houses one of the largest collections of Spanish art and manuscripts outside of Spain.

HBO series' stage tucked away in a Greenpoint lot is the largest theatrical set of its kind in the United States.

Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

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

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

The notorious headquarters of a corrupt political machine.

The site of the deadly Triangle Shirtwaist Factory Fire.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

In the early 1800s, surgery was also a show.

A terrific purveyor of natural history objects and curios.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.