Devil's Den is a boulder-strewn hill on the end of Houck's Ridge at Gettysburg Battlefield, used by artillery and 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 cannons, memorials, and walkways, including a bridge spanning two boulders.