The Led Zeppelin boulders are a small cluster of boulders that sit on the Potomac Heritage Trail just north of Windy Run Park. They are mostly easy climbing on decent rock, but there are a few hard problems on extremely high quality rock as well.
Because this area is right on a trail that hikers enjoy, please consider not bringing large groups, brush away your tick marks and chalk, don't listen to loud music and maybe try to be a good steward by picking up a few pieces of trash each time you go (there's always some). Just be considerate of the other folk on the trail and access to the rocks can remain uncontested.