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

The largest glacial erratic boulder on Cape Cod.

A very big rock just plopped down in the New England woods.

In the middle of suburban Staten Island, a nearly 150-year-old bakery is preserving the art of a disappearing New York treat.

This old-fashioned candy shop, ice cream parlor, and diner served as the setting for one of TV's most controversial series finales.

Journey through vintage Americana inside this small Massachusetts shop.

This once-private estate is now a dreamy, meditative garden that's open to the public.

The site of the first "historically true" UFO encounter in the U.S.

Take a step inside the picturesque studio of America’s most renowned sculptor.

The mansion home of author Edith Wharton.

Herman Melville wrote 'Moby Dick' in this landmark 18th-century house surrounded by farmland.

A history of the U.S. military, with a focus on Pennsylvania's contributions.

A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

At this farm in upstate New York, the former president plotted his reelection campaign.

The road plays 30 seconds of the Marine’s Hymn when driving over the grooved pavement.

The largest stone moai on Rapa Nui.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

One man’s obsessive, 30-plus-year quest is behind the pies at this spot on the Lower East Side.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

Final resting place of two dozen New York City harbor ships.

Starting in 1961, Brookhaven National Labs regularly irradiated a section of forest with a canister of Cesium-137 to study the effects of hard gamma radiation on an ecosystem.

This house was used by the FBI to broadcast disinformation to the Nazis during World War II.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.