A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The boulder on which Alexander Hamilton laid his head after a deadly duel can still be visited on the New Jersey coast.

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."

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The unassuming structure was part of a Major League Baseball stadium.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

Wine bottle sculpture with a ship's stateroom inside.

A hidden "place of interment for gentlemen."

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

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A collaborative art project that transformed a neighborhood in NYC's Queens.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

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

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

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

This dramatic rail curve was once the target of a failed Nazi attack.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

The site of the one and only battle of Lord Dunmore's War.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

This tiny man looms large over downtown Charleston.

A Manhattan office building is home to the world’s largest chess board.

Rusting ships sit in a desert where a sea used to be.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.