Between Blackfoot and Idaho Falls, this fascinating lava flow (see http://www.blm.gov/id/st/en/fo/upper_snake/recreation_sites_/Hell_s_Half_Acre_Lava_Trail.htmlis ) is accessible via trails from highway rest stops both north- and southbound. Spring wildflowers, crevice-dwelling ferns, innumerable junipers, and aromatic fernbush abound, and hikers might see a hawk during the day or hear a coyote at night. There will be more photos...
