I went there in 1990. Images alone don't do it justice. Fields and fields of grave markers.
I have only been there once. We used to go to Germany during Christmas for about a month. I like the Kris Kringle markets and goings on. I never liked France and rarely went there. I decided I wanted to see Normandy though. We were coming back from England on the Dover to Calais ferry headed to Normandy.
It was cold and rainy. I was completely by myself walking the beaches and climbing on the bunkers. My wife did not want to come. Like a lot of people you find yourself taking some sand away with you not even knowing why. It is a life changing experience that as you say, can't really be realized from pictures. The cemeteries just overwhelm you as you walk through them.
I have also toured the death camps in Germany, that is really something.