The Milesburn Shelter (now Cabin) is located in the Michaux State Forest in southern Pennsylvania and is maintained by the Potomac Appalachian Trail Club (PATC). Built in 1930 as a park ranger cabin, Milesburn was converted to an Appalachian Trail shelter by the PATC a few years later. It is one of the locked cabins along the AT between Waynesboro, Virginia and Duncannon, Pennsylvania that hikers can reserve in advance for a fee.

The Mackie Run Shelter in the Mont Alto State Forest (now Michaux State Forest) in Pennsylvania, was built in 1936, with the assistance of the Civilian Conservation Corps (CCC). Unlike other lean-to style shelters built in the area at this time, the Mackie Run shelter was built as a single structure rather than as a pair of smaller shelters. The Mackie Run shelter no longer exists. It was one of many shelters removed or relocated because it was too close to a road and thus too easily accessible to non-hikers. The Deer Lick Run Shelters, approximately one mile north, replaced the Mackie Run Shelter in this stretch of the Trail.

The Deer Lick Run Shelters in the Michaux State Forest in Pennsylvania were built after the removal of the Mackie Run Shelter in the early 1980s. Although these are newer structures, they are built in the same paired shelter style of many of the original lean-to shelters in this stretch of the Trail. These shelters are maintained by the Potomac Appalachian Trail Club (PATC).

Members of one of the Potomac Appalachian Trail Club (PATC) Shenandoah National Park trail crews creating water diversions on one of the many trails in the Park. Members of Appalachian Trail maintaining clubs devote hundreds of thousands of volunteer hours each year to the maintenance of the AT and its associated side trails.

Leaving the bus on a PATC trip to Smoke Hole, West Virginia, April 19, 1936. PATC hiking trips during this era were often organized with bus service for members.

The Three Springs Shelter was located in what is now known as the Roller Coaster section of the Appalachian Trail in Northern Virginia just north of the FEMA Mount Weather Operations Center. Built by the Civilian Conservation Corps in the 1930s on private land, the ownership of this shelter passed to the Potomac Appalachian Trail Club (PATC) in 1969, when the club purchased the shelter and 15 surrounding acres of land, including a section of the AT. This shelter no longer exists. 

The 1941 ATC Guide to the Paths of the Blue Ridge offers this description:

Three Springs Lean-to is situated in a small clearing near the summit of the Blue Ridge on its southeast slope one mile north of Mt. Weather. It occupies the site of the old Ashby farmhouse that had been built early in the nineteenth century. There is a chimney over the fireplace.

At that time, the Appalachian Trail was located on the east side of Blue Ridge Mountain Road, but was later re-routed onto the western side of the ridgeline.

The Ashby Gap Shelter in Northern Virginia was located just west of the village of Paris. Built by the Potomac Appalachian Trail Club in the 1941 on a tract of private land, the shelter was torn down in 1955, when the AT was re-routed away from the site. The 1941 ATC Guide to the Paths of the Blue Ridge offers this description:

Ashby Gap Lean-to is situated in a clearing near the summit of the Blue Ridge on the northwest slope, a little over a mile south of Ashby Gap. It is close to the site of an old cabin.

Members of the Potomac Appalachian Trail Club (PATC), Roanoke Appalachian Trail Club (RATC), and the Natural Bridge Appalachian Trail Club (NBATC) on a group hike to McAfee Knob, October 1935.

The Ashby Gap Shelter in Northern Virginia was located just west of the village of Paris. Built by the Potomac Appalachian Trail Club in the 1941 on a tract of private land, the shelter was torn down in 1955, when the AT was re-routed away from the site. The 1941 ATC Guide to the Paths of the Blue Ridge offers this description:

Ashby Gap Lean-to is situated in a clearing near the summit of the Blue Ridge on the northwest slope, a little over a mile south of Ashby Gap. It is close to the site of an old cabin.

Pinefield Hut was built in the summer of 1940 in a style typical to Shenandoah National Park (VA) at this time--a stone base with a wooden roof. This shelter is maintained by Potomac Appalachian Trail Club.

Pass Mountain Hut was built in 1939, and is constructed largely out of stone. It is located in Shenandoah National Park, on the east face of the mountains, about one mile north of Thornton Gap, where Highway 211 crosses Skyline Drive. Today the area around the shelter is heavily wooded, but when it was first built hikers had views up to Mary's Rock above Thornton Gap and into the foothills of Rappahannock County, Virginia. The Pass Mountain Hut was built and is still maintained by the Potomac Appalachian Trail Club.

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.