6. Delicate Arch, Utah
Arches National Park has more than 2,000 stone arches but the 65-foot tall Delicate Arch, the largest free-standing in the park, is by far the most famous and popular attraction. The trail to see it is 3 miles round trip and climbs 480 feet.
7. The Palouse, Idaho and Washington
This is a 4,000-square-mile region of natural wonder. How the hills were formed is a bit of a mystery. It was not by rivers and streams. Some experts say the area was the result of prehistoric dust storms and the wind dunes were blown in from the Pasco Basin when the ancient Lake Lewis was drying up.
8. Assateague Island, Maryland
The wild horses that travel the beach near Chincoteague, Virginia and Ocean City, Maryland are by far the biggest attraction on the island. They, as well as the dunes, wetlands and marsh islands, which are also home to more than 320 bird species, are protected by the National Park Service and Fish & Wildlife Service.
9. Valley of Fire State Park, Nevada
Just one look at the 40,000 acres of red Aztec sandstone outcrops and you’ll understand why it’s called the Valley of Fire. The petrified trees and petroglyphs are more than 2,000 years old. The park is open every day of the year.
10. Crater Lake, Oregon
It formed around 7,700 years ago, after a powerful volcanic eruption caused a tall peak to collapse and formed a deep basin. At 1,949 feet, Crater Lake is the deepest lake in the United States. There are no streams or rivers flowing into or out of the lake.