Fodor's Expert Review Biscuit Basin
Yellowstone National Park
Nature Sight
A short drive north of Old Faithful and accessed via an easy ⅔-mile loop stroll, this basin is also the trailhead for the Mystic Falls Trail. The namesake "biscuit" formations were reduced to crumbs when Sapphire Pool erupted after the 1959 Hebgen Lake earthquake. Now, Sapphire is a calm, beautiful blue pool again, but that could change at any moment.