Glacier National Park (Montana) Stunning glacial landscapes, Going-to-the-Sun Road, pristine lakes (Lake McDonald), and diverse wildlife.
Rocky Mountain National Park (Colorado) High-altitude peaks, alpine lakes, hiking trails (Longs Peak), and scenic drives (Trail Ridge Road).
Great Smoky Mountains National Park (Tennessee, North Carolina) Appalachian Mountain views, diverse plant and animal life, historical structures, and scenic drives.
Grand Teton National Park (Wyoming) Rugged mountain peaks, pristine lakes, Jackson Hole, and excellent hiking and wildlife viewing.
Yosemite National Park (California) Iconic granite cliffs (El Capitan, Half Dome), stunning waterfalls, giant sequoias, and diverse wildlife.
Grand Canyon National Park (Arizona) Majestic views of the canyon, hiking opportunities (Bright Angel Trail, South Kaibab Trail), and the Colorado River.