The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

At 207 feet, one of the world's longest continuous escalators.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The national park was once a plantation estate.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

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

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

The "All-Seeing Eye of God" symbol on this library is a clue to one of the many former lives of this building.

True to its name, this little house presents like a dollhouse, and surprising details are revealed with a quick peek through the window.

An abandoned stretch of highway, deteriorating next to the operational one.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

The largest piece of cut lead crystal adorned a grave for 75 years and is now the shining star of a glass museum.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

While seemingly a cruel joke, this bench actually honors an esteemed member of the community who passed away in 2006.

A diorama of the Civil War, fought by cats.

Experience the pivotal Civil War battle at this interactive museum.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Easter in Westminster may be the only time and place to behold Edgar Allen Poe made entirely of Marshmallow Peeps.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

This unique creation was made by the largest manufacturer of Christmas bulbs in 1946 to honor those returning from World War II.

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