The first national park is still one of the best, and visitors to Yellowstone National Park will find much more to see than iconic Old Faithful. Grand Canyon of the Yellowstone is a prime spot for hiking, while geothermal wonders abound in the Mammoth Hot Springs and Norris Geyser Basin areas.

Hayden Valley offers dazzling views of wildlife, including elk, bison, and grizzlies. To avoid the crowds and save on accommodations, skip summertime and go in spring or fall.