9. Yellowstone National park
Underneath the beauties of the Yellowstone National Park lies a slumbering volcano having the capacity to cause untold damage to humanity. The Yellowstone caldera is the result of three staggeringly violent eruptions, the ashes of which can be found in places as far as Iowa and Louisiana. In the present day, minor eruptions keep occurring every now and then to remind us that it is very much alive.
Image Credit: eco18