It's time for a road trip! From Washington, D.C., to San Francisco, you can visit all the best national parks in the U.S.

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 ...

Unlike its more famous neighbors—Bryce Canyon and Zion National Parks—this 2,240-acre sanctuary remains relatively unknown to ...