Haleakala’s summit stretches 10,023 feet (3,055 meters) above Maui’s world-renowned beaches. Vast swaths of its slopes—33,000 acres (13.4 hectares) from summit to sea level along the Hawaiian island’s southeastern coast—are protected within Haleakala National Park, where visitors hike, bike, camp, and catch sunsets (and sunrises) of a lifetime. Now considered a dormant volcano, Haleakala last erupted sometime between the 15th and 17th centuries.