The Civil War battlefields at Fredericksburg and Spotsylvania close at sunset. If you want to visit them after dark, you need a special permit and the direct supervision of a park ranger. This article in the Wash Post describes a recent excursion by the American Battlefield Ghost Hunters Society as its members, you know, looked for ghosts. It turns out they didn’t find any, but they did manage to keep a park ranger busy into the wee hours.