Look for this sign when seeking the trailhead. The...
White Rock Acres is never crowded, has solid rock and is on the Appalachian Trail corridor. Definitly a top-rope or very cruiser traditional leader spot (cruiser = easy 5th class trad leading is abundant). Antietam Quartzite (similar to Pond Bank, Seneca and the Gunks in some spots)
The Main Wall is 60ft in height with a handful of different route opportunities (mix and match). Some of the Main Wall is almost vertical with most less than vertical and broken up by some ledges (these ledges = great gear placement opportunities for the rookie trad leader)
Great spot to get away and practice anchors, rappeling, placing gear, etc. Never any crowds so its nice to practice out of the way and not be bothered or bother others (I enjoy the seclusion at least).
Just South of Boiling Springs, PA; the trailhead (marked with blue blazes) is just inside the "White Rock Acres" development.
In Boiling Springs cross over the 174, turn right onto Old Stonehouse Road and this will cross RR tracks and will then take a 90 deg turn left (take the turn left). Follow for a minute or two and you'll come upon Kuhn Rd (there will be fields on your left and right and a stream just ahead). Turn right onto Kuhn and up on your right very shortly (seconds) the blue blazed trailhead will be there. Pull over in one of the obvious pull offs.
If you want to practice self rescue, anchors, rappeling, belaying, ascending a rope, etc this is the place to do it! Its high on a ridge (nice approach), great views, sunny but not terrible (South facing yes but plenty of trees for shade), its public land, you can take the dog (if your dog isn't very nice its ok because the chances of you running into someone else climbing is slim, but possible) and family.
Albeit this isn't an area with massive potential to be a badass "push your limits" spot, as a Central PA climber EVERY little bit of rock on public land needs to be known about so we Central PA climbers have options for training for bigger out-of-state objectives.
Worth your time if you are looking to learn/refine some skills. If you want to push your self or just want something harder than easy 5th class go to Shaffers, Pond Bank, Safe Harbor, Boxcar, Chickies or one of the amazing bouldering areas around.