The document summarizes information about the Grand Canyon and Yellowstone National Park. It discusses the geography, history, culture, weather, fauna, and things to do at each location. The Grand Canyon was carved by the Colorado River and is home to Native American ruins. It has extreme temperature variations and attracts over 5 million visitors annually. Yellowstone was the world's first national park and contains half the world's geothermal features. It has also has a wide range of temperatures and wildlife viewing opportunities.