Daisy Geyser erupting in Yellowstone National Park
Daisy Geyser sends its column skyward in the Upper Geyser Basin, where the world's largest concentration of geysers is connected by accessible boardwalks. Old Faithful is the headliner, but the supporting cast here is worth the walk. © Brocken Inaglory, CC BY-SA 3.0, via Wikimedia Commons

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