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Antietam National Battlefield, Sharpsburg, Md.

Distance from Baltimore: 70 miles, about an hour-and-a-half drive Why it's worth the gas: More than 100,000 Union and Confederate soldiers met on Sept. 17, 1862, in a battle that produced 23,000 casualties. A century and a half later, you can imagine the roar of cannon and guns as you pass... Amy Davis, Baltimore Sun