Ever heard of it?
It is, in a nutshell, a giant painting on a cylindrical canvas, painted about 150 years ago. In the 30s a third dimension was added (that sounds fancy doesn't it? It means they added a platform and statues to create a 3D effect).
It tells the story of the Battle of Atlanta.
So you sit in this little amphi-theatre which then rotates 360 degrees while music plays and a narrator tells the story of the painting and its characters. It's like a short movie, from the days before moving pictures.
We watched it twice. Either it is that cool or we are that cheesy, take your pic.