Yellowstone National Park. Yellowstone National Park contains some of the strangest and most interesting geological features found anywhere in the world. This vast caldera or volcanic basin is the remnant of a giant volcano that blew its top many millennia ago. The area still sits atop a hot spot in the earth’s crust and provides us with a unique opportunity to view a fascinating assortment of highly active geothermal phenomena. It is one of the few places on our planet where hot water and steam come bubbling, fizzing, gurgling, hissing and even exploding out of the earth at thousands of colorful mineral-encrusted hot springs and vents. Cauldrons of mud bubble and splat their colorful liquid plasters to form large volcanic cones. Hundreds of geysers sleep in placid hot springs for hours or days, then at semi-regular intervals erupt into great plumes of hot water and steam rising hundreds of feet overhead before retiring to their tepid hibernation. You can find geysers in a few other locations around the world, but there are more active geysers in Yellowstone National Park than there are in every other location combined.
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