After visiting all 63 national parks in the US, my favorites include Yosemite and Grand Teton. I think one of the worst parks is Gateway Arch.

National Park Week is coming April 19, offering visitors a chance to see some of the treasured U.S. landmarks for free.

I visited all the major US national parks and ranked them based on factors like beauty and crowd size. My favorites include Grand Teton and Acadia.