“Doors Open Gettysburg” offers an insider’s look at the history of four magnificent battlefield and farm structures at Gettysburg National Military Park in Pennsylvania.

Thirty-two-million years after a saber-tooth cat stalked prey on the landscape known today as Badlands National Park, a 7-year-old girl working for her latest Junior Ranger badge spotted the animal's fossilized skull protruding from a hillside.

Beginning on Monday, May 6, the National Park Service will initiate a limited capacity reopening of The Oaks, the home of Booker T. Washington in Alabama.

Hallowed ground that absorbed the blood of colonials fighting for independence and nearly a century later of Union and Confederate soldiers engaged in a civil war are among the top 11 "Most Endangered Historic Places" in the United States identified by the National Trust for Historic Preservation.