As one of the Seven Natural Wonders of the World, Grand Canyon National Park is a bucket-list trip. Start at the South Rim’s visitor center for general information on ranger programs and cultural demonstrations. Then, walk along the Rim Trail or take the shuttle to historic buildings like Hopi House, Kolb Studio, and Desert View Watchtower. Hoping to avoid the crowds? Visit in the fall, when Gambel oak and Fremont cottonwood add color to the canyon.