Rte F923 (off Rte 910, but for 4WDs only) leads you to the valley of Hrafnkelsdalur, full of sites relating to Hrafnkell’s Saga . The remote farm Aðalból was the home of the saga’s hero, Hrafnkell Freysgoði, and his burial mound is here. There’s a marked saga trail, threading together places mentioned in the story. There's a guesthouse and campsite here; meals are available (notice required), as is petrol.
You can also access Aðalból from the Ring Road - it's 43km on Rte 923 (which becomes an F road south of the farm).