Haleakala is an active, but not currently erupting, volcano that last released its fury in 1790. Over 200 years later the land surrounding the lava flow is still barren. The summit rises 10,023 feet above sea level. The crater is 3,000 feet deep, 7.5 miles long and 2.5 miles wide – a total of 22 miles in circumference. Click here for more info on the Haleakala Crater.