Lava Beds National Monument
About midway between Crater Lake and Lassen Volcanic national parks, this 47,000-acre tract of lava beds is a popular stop among travelers taking the scenic route between these two parks. The lava beds are just down the road from the Tule Lake and Lower Klamath national wildlife refuges. Many of the top attractions at Lava Beds are underground lava tubes created 32,000 years ago during the eruptions of Mammoth Crater. You can buy lamps and hard hats in the visitor center to tour these fascinating, bat-filled caves. The park has miles of hiking trails above ground as well.