Gettysburg's premier award-winning lodging, the Brickhouse Inn Bed and Breakfast, is a mere two minutes walk from the Gettysburg National Cemetery, also known as the Soldiers' Cemetery. Visitors to the town ought to visit this historic park, where President Lincoln gave his celebrated Gettysburg Address. Here you can walk among tall trees and monuments to soldiers who fell in the Battle.
I recommend an interesting book: "Lincoln and the Human Interest Stories of the Gettysburg National Cemetery", by James Cole and Roy Frampton. They give a detailed account of the founding of the burial place for Union soldiers killed in the Battle, as well as the dedication ceremony. The authors were instrumental in finding the spot where Lincoln gave his speech - which is actually just over the fence in the civilian cemetery.