Timothy O'Sullivan recorded this image of the Slaughter Pen in front of Big Round Top just days after the battle ended. There are several dead Confederates among the rocks in the image. The distinctive slanted rock the man is standing on was discovered by William Frassanito in 1967. Before that this was thought to be at the foot of Little Round Top. Usually this area in front of the Devil's Den parking area is far too overgrown to see the slanted rock, but a few years ago, I happened to be in town right after it had been cleared when I took the modern photo below.