Vicksburg controlled access to the Mississippi River, and it's seizure was one of the turning points of the Civil War. A 16-mile driving tour passes historic markers explaining battle scenarios and key events from the city's long siege, when residents lived like moles in caverns to avoid Union shells. Plan on staying for at least 90 minutes. If you have your own bike, cycling is a fantastic way to tour the place. Locals use the scenic park for walking and running.