Mt. Haleakala, which means "house of the sun," is accessible by 2 challenging hiking trails as well as a modern, if very curvy, road. Throughout the 10,000 foot climb, the environment seems to change right before your eyes, from subtropical rainforest to subalpine desert.
Haleakala is volcanically active, and last erupted in 1790. The Haleakala crater is huge: 3,000 feet deep, 7.5 miles long, 2.5 miles wide, and 22 miles in circumference. It’s a spectacular view from the Haleakala summit, with Maui at your feet and the land surrounding the lava flow still barren.