The Pine Knob Shelter sits just north of the footbridge over I-70 near the mid-point of the Appalachian Trail in Maryland. Built by the Civilian Conservation Corps in the 1939, this shelter is an excellent example of the traditional lean to design favored at that time. It is 1046.6 miles north of Springer Mountain (GA) and 1143.2 miles south of Mount Katahdin (ME).