In northeastern California, Lava Beds National Monument is reachable from SR 139, following the brown highway signs from Tulelake (the southern entrance road to the monument is paved but in poor repair). Lava Beds National Monument was created from molten lava spewed centuries ago from Medicine Lake volcano. When the lava cooled, the monument's rugged terrain was formed. The 46,500-acre area is characterized by cinder cones, deep chasms and more than 450 lava tube caves of various sizes. Learn More...