Yellowstone National Park was the first ever national park. Its site contains the largest concentration of geysers in the world. Although the rain prevented me from sleeping while we were camping, the geothermal features and the wildlife more than made up for it. Old Faithful erupted for over 30 seconds, shooting out a massive volume of water and steam high up in the air. And a huge mass of steam billowed from the Grand Prismatic Spring, covering the entire boardwalk for 5 minutes. I did not happen to encounter any grizzly bears during my trip, but I did find some black bears.