Grand Prismatic Spring is mesmerizing. Yellowstone's largest hot spring has a deep cyan core, ringed by stinging acid yellow and fiery orange. The science is fascinating too: the water has different temperature bands, each of which is inhabited by a specific type of bacteria making for a distinctive hue. It's hemmed in by boardwalks, so visitors can get a closer look.

Now check out these incredible early images of the world's best-known landmarks

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The must-see attraction in every US state