The world's largest piece of copyrighted artwork.

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

A mountain pass used by Prohibition-era bootleggers to facilitate traffic into and out of Canada from Vermont.

This boulder with a 200-word legal dedication to God has remained hidden in the woods for over 150 years.

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Oldest church in the United States that is still in continuous use.

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

Hut with supplies for shipwreck survivors.

Overgrown ruins of a turn of the century island fort that sees very few visitors.

The site of the tragic isolation of Nipmuc Native Americans left to perish in King Philip's War.

A memorial dedicated to victims of the Irish Potato Famine who perished while quarantined on this island.

Second largest wastewater treatment plant in the country.

Dedicated to "the father of U.S. life insurance."

A century-old factory reborn as an artist-run live-work building.

Earliest version of the American flag can be seen atop the hill where it first flew.

Three prestigious academic collections come together to create a world-class natural history museum.

Impossibly life-like natural history models created out of glass by a father and son.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

One of the last remaining movie theatres in the country that features a rear-projection system.