Annapolis Rock is a 5.1 mile out and back trail located near Boonsboro, Maryland. It is part of the Appalachian trail and its one of the most popular hikes in Maryland. The views from the lookouts are spectacular on a clear day and you can see Greenbrier Lake from the southeast. The trail is primarily used for hiking and rock climbing and is accessible year-round. Dogs are also able to use this trail but must be kept on leash.