Some National Parks — like Yosemite in California, Grand Canyon in Arizona, Zion in Utah, and Great Smoky Mountains on the East Coast — are famous for their trails that appeal to seasoned hikers.

Get any of our free daily email newsletters — news headlines, opinion, e-edition, obituaries and more. Sleeping on the ground. Walking long distances on steep trails or no trails. Carrying heavy loads ...

Adventure photographer Nate Dodge stepped foot in Yellowstone for the first time last fall and was amazed by its sheer size. “I had no concept of the scale of the national park,” he says. “As we were ...