Yellowstone National Park is the oldest national park in the United States and home to the world’s most famous (and possibly favorite) geyser. The living classroom that Yellowstone’s geological features provide first-hand experience of the planet’s largest supervolcano, and also, the most reliable eruption–so reliable that you can nearly plan your visit for when the geyser goes off.
Old Faithful is one of almost 500 geysers in the park. There are six geysers in Yellowstone that the park rangers can predict eruption times for Old Faithful. Castle, Grand, Daisy, Riverside, and Great Fountain.
Evidence of glacial activity, lava flows, and erosion are as abundant as the wildlife in Yellowstone, and booking a guide so you don’t miss one detail, is always recommended–because every visit to the Upper Geyser Basin and all of its geothermal features is unique. The hydrothermal basins provide important habitat for all species in the park, and thus regardless of the season, there is always a variety of activity in this area of the park.