Olive Green cabin, owned/operated by the Potomac Appalachian Trail Club is a two floor primitive cabin near Frederick, Maryland. It's a log cabin that was built around the mid-1860's. The last private owner, Olive Green lived in it until the 1980's (I think) when she was still living primitively without electricity or water. She grew her own food and had livestock on her property. The cabin itself is stocked with various cookware (including cast iron), bed frames, tables, chairs, books and games. We went in December after a storm and needed to shovel our way to the outhouse. Manual labor is not a bad thing! The opportunity to stay here and live primitively for a weekend was nice. The only downside is that the cabin is not effectively insulated, with numerous holes between the logging that lets a good amount of cold air in at night. There is also a wood burning stove on the first floor that's great for cooking on, but doesn't produce a lot of heat that needs to make its way to the sleeping quarters in the loft.