U.S. News Insider Tip: Some visitors, especially kids, might have respiratory discomfort at Norris Geyser Basin, as the sulfur smell can be strong. – Catherine Parker Old Faithful may be ...

Home to Yellowstone's Grand Prismatic Spring, the Midway Geyser Basin leaves visitors in awe of its rainbow-colored pools and powerful geyser. In addition to the Grand Prismatic Spring ...

100 Spring Plain in Norris Geyser Basin, Yellowstone National Park ... molten sulfur carries some of it toward the surface, where lower temperatures quench the sulfur to form the pumice-like ...