Visible to the south from I-15, Cima Dome is a 1500ft hunk of granite spiked with volcanic cinder cones and crusty outcrops of basalt left by lava. Its slopes are smothered in Joshua trees that collectively make up the largest such forest in the world. For close-ups, tackle the 3-mile round-trip hike up Teutonia Peak (5755ft), starting on Cima Rd, 5 miles northwest of Cima.