Kick off the ride from Custer, South Dakota on Highway 16A, then head north on State Route 87. You’re now on the Needles Highway, so-named for the oddly-shaped granite spires it threads around. The highway skirts hairpin turns and goes into tunnels blasted through granite walls—all of which means you can count on sightseer-induced traffic jams most days. After Needles Eye Tunnel, merge onto Highway 87, and then turn off for Sylvan Lake, with its cool rock formations. A few miles later, Route 244 will carry you east to Mt. Rushmore.