Located 25 miles south of Tucson in Sahuarita. I-19 south to exit 69 going west 1/10th mile past La Cañada to entrance at 1580 W. Duval Mine Road. This formerly active Titan ICBM complex is the only U.S. site that has not been destroyed. On an underground tour you can see a massive roll back silo door, visit the launch control center, and watch demonstrations of monitoring and countdown procedures. Admission fee.