The crater at the summit wasn't shaped that way volcanically. instead it’s eroded rock was carved by wind and rain. But its scale is lunar: 7 miles across and nearly 3,000 feet deep. On clear days, you can see the Big Island from Haleakalā’s peak. Keep your eyes peeled for Mauna Kea and Mauna Loa in the distance. via Ali'i Resorts - Maui | Maui Hawaii