In MD., the best places to climb are Annapolis Rocks; the approach is about an hour; Rocks State Park, although there is not alot there. My favorite is the Virginia side of Great Falls Park, although there is only top-roping. The rock is mica-schist and not good for leading at all. Not too far away are 2 great crags where you can lead or top-rope: Crescent Rocks in Virginia near Leesburg, and Schaefer Rocks in Quincy township, Pa. just north of Hagerstown,Md.
ClimbinBob