Grand Teton
Photo: Grand Teton / Jennifer Coulter / iStock

Wyoming

Grand Teton National Park. The 40-mile-long Teton Range and Jackson Hole valley, along with Yellowstone National Park 10 miles south, constitute the almost 18,000,000-acre Greater Yellowstone Ecosystem, one of the world's largest intact mid-latitude temperate ecosystems. This is one of the best places in the U.S. to go camping and really escape in nature. Just book your spot in advance.