Volunteers place over 23,000 candles on the battlefield, each representing a casualty from the bloodiest single-day battle in American history. Driving tour begins at 6:00 p.m. on Route 34 east of Sharpsburg. In the event of high winds or heavy rain, this event will be rescheduled. Several of the park roads will not be available to tour after 3:00 p.m.  Location: Antietam National Battlefield | MapTime: 6:00 PMPhoto by Keith Snyder