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

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

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A mass grave for victims of one of the city’s worst fires.

This neo-Gothic former auto showroom is one of the few remaining reminders of Brooklyn's "Automobile Row."

A gazebo that inspired the fifth episode of the "Twilight Zone" still stands in the creator's hometown

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

The oldest continuously operating farm in New York State.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

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

These historic buildings once housed the headquarters of one of the most infamous gangs of New York.

The home of the first American-born saint is one of the only curved buildings in New York.

The first piece of public art dedicated to LGBT rights.

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

Site of the first pathological and bacteriological research facility in the United States.

Red frames showcase remnants of one of New York's original subway stations.

The greatest real estate coup of all time.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

The Hudson River School comes alive at this palatial estate.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

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