6. Norris Geyser Basin.
Old Faithful may be Yellowstone’s most well-known geyser, but this geothermal hot spot in the Norris area is the park’s oldest and hottest. From its boardwalks, visitors can see rare acid geysers like Echinus Geyser, as well as the tallest active geyser in the world, Steamboat Geyser. The basin’s geysers can be visited 24 hours a day during the summer season.