Although a portion of the painting had been removed "for conservation", the display was still impressive, with a 1960s-style sound and light show, the cyclorama illuminated in the darkness, almost like a 70-mm IMAX movie from the 19th Century.
The painting depicts "Pickett's charge" of July 3rd, 1863. It was painted by Paul Philippoteaux, who visited battlefield almost 20 years later. The cyclorama, in the best Beaux Arts style, features some very French-looking haystacks, and a small portrait of the artist by a tree observing the battle. It is definitely worth a detour, as the Guide Michelin might say.