The crater at the Haleakala Volcano National Park on Maui was not made by an eruption, but by the constant erosion of the wind and rain in the time since the last eruption. Haleakala is, if you count distance from the ocean floor, taller than Mount Everest by about 600 feet. However, as you look around you as you walk in the crater, you can see the erosion happening before your eyes as every footstep kicks up some dust into the wind, and any step off the path starts a mini slide of fine volcanic sand down the valley to the sea.
You can see a list here of all the United States National Parks, with links to our stories about the ones we've visited.
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