America's national parks in pictures

Yosemite's Half Dome at sunset Photograph: Shubroto Chattopadhyay/Corbis

A climber scales the 1,000-plus vertical metres of the Nose of El Capitan, Yosemite National Park, California Photograph: Galen Rowell/Corbis

Bear fishing for salmon in Brooks River, Katmai National Park, Alaska Photograph: Paul A. Souders/Corbis

Mist in Great Smoky Mountains National Park, North Carolina/Tennessee border Photograph: Jay Dickman/Corbis

A cabin deep in the forest, Great Smoky Mountains National Park, Tennessee Photograph: Gary Braasch/Corbis

Grand prismatic spring in Yellowstone National Park, Wyoming Photograph: Momatiuk - Eastcott/Corbis

The Subway in Utah's Zion National Park is a tunnel-like slot canyon, sculpted over time by water and wind Photograph: G. Brad Lewis/Science Faction/Corbis

Rafting on the Colorado River through the Grand Canyon, Arizona Photograph: Kevin Fleming/Corbis

Autumn colours in New River Gorge national park, West Virginia Photograph: David Muench/Corbis

Giant sequoia trees, Sequoia National Park, California Photograph: Gavin Hellier/Robert Harding World Imagery/Corbis

Looking out from under canvas at the mountains of Kings Canyon National Park, California Photograph: Kelly Harriger/Corbis

Grand Teton National Park, Wyoming, USA Photograph: Buddy Mays/Corbis

The Teton Range reflected in Jenny Lake Photograph: Michael T. Sedam/Corbis

Calm waters in Acadia National Park, Maine Photograph: Blaine Harrington III/Corbis

Acadia National Park's coast in autumn Photograph: Karl Kinne/Corbis