Annapurna, in the Himalayan Mountains of Nepal.
The Teklanika River valley in Denali National Park.
The dunes of Great Sand Dunes National Park in Colorado, at sunrise.
A historic steam engine on the tracks in Cuyahoga Valley National Park, Ohio.
Canoeing down Cedar Creek in Congaree National Park, South Carolina.
The worn sandstone walls of Antelope Canyon in Arizona.
Vegetables cooking in a cast iron pot over a campfire.
Annapurna South at sunrise.
Folds of ice on the surface of Exit Glacier in Kenai Fjords National Park in Alaska.
A backpacker on the Appalachian Trail in the Mahoosuc Range of Maine.
A loon on a lake in Maine.
A heron stands in a marsh in Cuyahoga Valley National Park, Ohio.
A wild pony grazing in Assateague National Seashore.
The village of Chhomrong in the mountains of Nepal.
The shore of Isle au Haut off the coast of Maine, part of Acadia National Park.
Climbing the stone stairs of the Mist Trail in Yosemite National Park.
The shore of St. John, near U.S. Virgin Islands National Park.
A grizzly grazing in the autumn tundra along the park in Denali National Park, Alaska.
Trekkers on their way into the Annapurna Sanctuary in Nepal.
A section of the South Kaibab Trail in Grand Canyon National Park, Arizona.
A water moccasin snake laying in the branch of a tree in Congaree National Park, South Carolina.
The Grand Canyon.
Monument Valley at sunrise, along the border of the Arizona and Utah.
Sunlight shining into the twisting depths of Antelope Canyons, in Arizona.
Hoodoos in Bryce Canyon National Park, Utah.
A braided rover winding out of the mountains in Denali National Park, Alaska.
The park road in Denali National Park winding through the autumn tundra.
The trail to Angels Landing in Zion National Park, Utah.
Footprints leading up a sand dune in Death Valley National Park.
A canyon in Death Valley National Park.
A view from the fire tower on Stratton Mountain in the Green Mountains of Vermont.
The snowcapped ridges of the Himalayan Mountains of Nepal.
A mountain range in Denali National Park, Alaska.
The dense forest of the Green Mountains of Vermont.
Bourne Pond, in the Green Mountains of Vermont.
A trekker crossing a suspension bride in Nepal.
Footprints along the ridge of a dune in Great Sand Dunes National Park, Colorado.
Part of the Continental Divide Trail in Rocky Mountain National Park, Colorado.
The shore of Resurrection Bay in Seward, Alaska.
Backpackers hiking out of Hanging Valley in Church State Park, Alaska.
The Cathedral Trail on Mount Katahdin in Baxter State Park, Maine.
A close up view of the summit of Annapurna South in Nepal.
Trees growing along the shore of Cedar Creek in Congaree National Park, South Carolina.
The Knife’s Edge Trail on Mount Katahdin in Baxter State Park, Maine.
A skewed arch tunnel along the Trolley Trail in Philadelphia’s Fairmount Park.