The Great Wall isn't in the main Photographer's Peak area, but it is close, and uses the same trailhead. There is 7 routes that I know of on the wall. The climbing is good, but the routes are short and not as good as those on Photographer's Peak.
Drive to the Photographer's Peak parking area described under the area directions. The Great Wall is found by getting on the old dirt road that leads east from the parking area. This road quickly turns to a singletrack, and then soon is so overgrown that it disappears. At this point, continue walking through the overgrown treeless meadow, heading more or less in a straight path away from the car. Then you will cross Trail #4, and Great Wall is just up the hill. Walk up to its base through dense trees. Then about 20 feet of easy scrambling is required to get to a shelf at the base of the routes.
Browse More Classics in Great Wall
Mountain Project's determination of some of the classic, most popular, highest rated routes for Great Wall:
Cascade 5.9 Sport, 1 pitch, 60 feet
California Screamin' 5.10 Sport, 1 pitch
Featured Route For Great Wall
The route Ascends the vertical Face between the two prominent water grooves. You should have some long runners or two ropes to avoid rope drag.Just follow the bolts up, then left, then up, then right, then up, then left, then up and to the top. The perfect route for 2 ropes. It's better than it sounds....[more] Browse More Classics in SD