So far I haven’t visited any national park in the U.S, but friends of mine who travelled in USA recommended the national parks below. Have you been to any of them?

Grand Canyon National Park in Grand Canyon, Arizona. Established 1919.

Yosemite National Park in Sierra Nevada, California. Established 1890.

Rocky Mountain National Park near Estes Park and Grand Lake, Colorado. Established 1915.

Yellowstone National Park in northwestern Wyoming and parts of Montana and Idaho. Established 1872.

Olympic National Park near Port Angeles, Washington. Established 1938.

Grand Teton National Park - Northwestern Wyoming. Established 1929.

Channel Islands National Park - Visitor Center in Ventura, California. Established 1980.