Touring Gettysburg with one of the recorded devices (probably CD now) is the way to go. You can drive from point to point in your car while the battle is being described. Also, they have an auditorium where a host will describe the battle and show the troop movement on a scaled image which is great. We as a family have walked Gettsburg many times and I always get goosebumps, just trying to imagine what went on that day.
One other very interesting battlefield I got to visit was Okinawa. My daughter and boys spent three years there with SIL (Marine). We spent five weeks touring the island and playing golf. One of my most interesting travels. They lived at Kadena Air Base, the original Japanese air base. We visited Suhri Castle, the underground caves, the cliffs where many civilians committed suicide, Pease Memorial Park and Motobu Peninsula, where Ernie Pyle was killed. One of my most memorable experiences. Naha, the capital, is a city of 300K and pretty modern thanks to the American forces based there. It's called the poor man's Hawaii. About 1300 miles south of Tokyo. Flew Northwest.