Pennsylvania, USA

A couple of days in Gettysburg, Pennsylvania might not be enough to fully understand what transpired on July 1-3, 1863. This is the war between the Union and the Confederate that resulted in the largest number of casualties in American Civil War. The Confederates from the southern part of US fighting to preserve slavery while the Union from the north hoping to end it. 

This 3-day battle is considered the war's turning point as the Union soldiers claimed victory over the Confederate soldiers. It is in Gettysburg where Abraham Lincoln, then President, made the now famous "Gettysburg Address".