Devil's Den is a boulder-strewn hill on the south end of at Gettysburg Battlefield, once used by artillery and infantry (e.g., sharpshooters) on the second day of the 1863 Battle of Gettysburg during the American Civil War. A tourist attraction since the memorial association era, several boulders are worn from foot traffic and the site includes numerous cannon, memorials, and walkways, including a bridge spanning two boulders.