All that remains of one of the Civil War's more deadly POW camps is a simple flagstone.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

Fossilized sea bottom and lime quarry.

Oldest surviving example of a Dutch saltbox frame house in America.

There's a piece of New York City transportation history hidden in plain sight at a Manhattan subway stop.

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

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

A big shiny gin and whiskey distillery in Sunset Park.

Micro-distillery in Brooklyn produces New York’s first homemade rum since Prohibition.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

This small road tunnel is the only place where you can cross beneath the Erie Canal.

This 220-year-old house is a reminder of New York City's Dutch past.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

Play heads or tails with thousands of different coins.

The home, museum, and death site of Kodak's influential founder.

The highest point on the island known for buildings that touch the sky.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

Walk into the 19th century without leaving Brooklyn.

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

A Frankenstein blend of science and art allows one tree to produce 40 different types of stone fruit.

The notorious headquarters of a corrupt political machine.

The site of the deadly Triangle Shirtwaist Factory Fire.