Each summer, more than half a million tourists come to Gettysburg, a battlefield in the most divisive conflict in American history. After marching around in the heat, thousands stop in at Mr. G’s for some of the best ice cream in town. As they battle with their melting orange pineapple, they can look across the street to the new Unity Park and the newest of Gettysburg’s 1,300-plus monuments. Most commemorate battle; this one commemorates unity. It encourages a “focus on unity and peace.” (excerpt