520-387-7742, 520-387-6849, off AZ Hwy. 85, south of Ajo, AZ. $8/vehicle—valid for 1 week. Open 24 hours. Visitor center open 8 a.m.–5 p.m.
A forest of organ pipe cactus. In May, June, and July the cactus sprout large lavender-white flowers that open only at night (bring a camera flash). Excellent area to find spring wildflowers.