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.

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 ...

Officials must determine whether the bear was defending itself or acting aggressively — a decision that will decide the ...