I've been there, but it was a very long time ago. Or so it seemed to me! When we were living on the East Coast(Maryland), we went to see it on vacation. The most I can remember of Gettysburg(I was 10 or 11 then, now I'm 49), I remember walking around a large statue, or memorial and seeing many graves around it in a large circle.
There may have been more, but I don't remember those. I don't even remember if they had all the displays/tours they have now. Besides that memorial part, I do remember the visitors center. Maybe it was an older one, because I believe they may have replaced it with a larger, more modern one.
I remember reading something, about a young woman being killed there, by the name of Jennie Wade, (I think!). She was engaged to a soldier fighting around there. Anyway, as the story went, she was apparently in this house, where there had been fighting going on around the house.
She was taking some bread out of/or putting it in, the oven in the kitchen, and a bullet sort of ricocheted(sp?)outside, and came into the window, and hit her, killing her. I remember thinking how so very sad it was! But these places we visited were all I remember, besides reading about that poor girl!