This shale formation along the Appalachian Trail once inspired the third president of the United States.

Home of a 28-foot tall stalagmite known as the War Club.

The mounds at this site were reconstructed with the help of archaeologists and historians.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

The national park was once a plantation estate.

The romance of early commercial flight still fills this Art Deco destination.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

The Aldie Gristmill was once the largest factory of its kind in Loudoun County.

The former home of the man whose radical ideas changed the nation.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Eclectic architecture in the woods of New York.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

The press that first printed the Book of Mormon.

A field in which God and his son Jesus purportedly appeared to a young farm boy named Joseph Smith.

Golden plates containing what would become the Book of Mormon were believed to be buried on this New York hillside.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.