The Rocky Run Shelter in Maryland pictured here is the original shelter built in 1940 by the Civilian Conservation Corps (CCC). This Adirondack style log lean-to remains on the Trail but in 2008 volunteers from the Potomac Appalachian Trail Club constructed a new two story shelter.

The Crampton Gap Shelter is located near Frederick, Maryland and is one of the original log lean-tos built by the Civilian Conservation Corps in the 1939. It is maintained by the Potomac Appalachian Trail Club.

The Raven Rock Shelter was built by the Potomac Appalachian Trail Club (PATC) in 2010 as a replacement for the Devil's Racecourse Shelter, one of the shelters constructed by the Civilian Conservation Corps in the 1930s. Because the Devil's Racecourse Shelter was in need of substantial renovation, and because it had become a preferred location for non-hikers to stage parties (it was close to a road), the PATC decided to build the new shelter much further uphill, away from the road, and close to the Trail.

This shelter, located in Washington County, Maryland, is dedicated to the memory of Ensign Phillip Cowall. Its construction was financed with funds donated to the Potomac Appalachian Trail Club (PATC) by his parents, David and Cindy Cowall of Salisbury, Maryland, in 1998, in memory of their son, who had loved the Appalachian Trail. The shelter is located 1054.8 miles north of Springer Mountain (GA) and 1135 miles south of Mount Katahdin (ME).

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).

This 1938 map of the Appalachian Trail from the Susquehanna River to the Virginia/Tennessee border, appeared on the back of the stationary of the Appalachian Trail Conference beginning in the late 1930s. It describes those portions of the Trail covered by the PATC's Guide to Paths in the Blue Ridge: Measured Distances and Detailed Directions for 506 Miles of the Appalachian Trail and 65 Miles of Side Trails in Virginia and Adjacent States, originally published in 1931 and reprinted numerous times since. The route of the Trail in 1938, especially in southern Virginia, is quite different from the current route.