When you think of Yellowstone, you think of Old Faithful. And yes, you need to see this geyser, but there's nothing unexpected about it. It lasts about 90 seconds and you have to jostle for a view of it because of the crowd. If you want to really enjoy a geyser, try to time your visit to the thermal basin to take in Castle Geyser. Not only is the cone of this geyser gigantic compared to Old Faithful, it also has an eruption that lasts for almost half an hour. It spurts, trickles, flashes, gushes, and generally makes itself known from a variety of viewpoints in the basin. It only erupts about twice a day, however, so you have to be lucky to see it. And it is not as predictable as Old Faithful - the eruption time can be anywhere within a two-hour period. But don't feel you have to sit still for two hours to catch it. Hike around the basin to see the dozens of other springs and geysers - just glance back to Castle once in a while to see the first of its eruption, then quickly walk back for a closer look.
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