• Yellowstone National Park in Wyoming, Montana, and Idaho is known for its geysers, hot springs, and mudpots. It is also home to a variety of wildlife, including bison, elk, and bears.
• Yosemite National Park in California is famous for its towering granite cliffs, waterfalls, and giant sequoia trees. It is also a popular destination for hiking, camping, and rock climbing.
• Grand Canyon National Park in Arizona is home to one of the world's most spectacular natural wonders, the Grand Canyon. The canyon is over a mile deep and up to 18 miles wide, and it is a popular destination for hiking, camping, and sightseeing.

• Glacier National Park in Montana is known for its pristine lakes, towering mountains, and abundant wildlife. It is a popular destination for hiking, camping, and fishing.
• Rocky Mountain National Park in Colorado is home to some of the most iconic mountain peaks in the USA, including Longs Peak and Mount Evans. It is a popular destination for hiking, camping, and mountaineering.

Ultimately, the most beautiful national park in the USA is the one that you enjoy the most. So, get out there and explore!