Described as a "weird and scenic landscape", Craters of the Moon certainly lives up to its reputation. It was established in 1924 to preserve the unique volcanic features of this enormous lava field. The 750,000-acre monument contains a diverse array of volcanic features including volcanic rifts, cinder cones, spatter cones, shield volcanoes and lava tube caves. A surprising number of plants and animals have adapted to live in the harsh volcanic and high desert environment.
Hell's Half Acre is the easternmost and second largest of the young basaltic lava fields of the Snake River Plain, Idaho. It covers an area of about 400 sq km SW of Idaho Falls. The last eruptions occurred about 5200 years ago