Maui’s Haleakalā National Park is an otherworldly place of black lava flows and giant reddish-hued cinder cones, dominated by a 10,023-foot-tall dormant volcano. SR 378, the spectacularly scenic Haleakalā Highway, climbs above the clouds to the crater (actually a valley created by erosion). The long road to the top is slow going but totally worth the adventure.
