More than 250 shelters line the Appalachian Trail from Springer Mountain in Georgia to Mount Katahdin in Maine. The oldest of these shelters date from the 1930s, while the most recent have been built in the past decade. They vary in construction and design from simple Adirondack style lean-tos made of logs cut and peeled in the nearby forest, to more elaborate structures with more than one story, or a front porch, or other novel features. Like the Trail itself, these shelters are maintained by the network of volunteer clubs responsible for the upkeep of the Trail. They are intended for use by long distance hikers, but are open to all hikers seeking shelter along the Trail. Almost all are located close to a consistent water source and almost all have their own privy.