Celebrate America's beauty during National Park Week

A sun sets across the vast nature at Big Bend National Park.

Like a frozen waterfall, a wall of ice more than 40-feet-high stretches down to the high-tide line on Otter Cliffs overlooking the Atlantic Ocean at Acadia National Park in Maine.

More than 195,280 square miles are protected, including the Mariana Trench and the waters and corals surrounding three uninhabited islands in the Northern Mariana Islands, Rose Atoll in American Samoa and seven islands strung along the equator in the central Pacific Ocean.

Delicate Arch at Arches National Park in Utah.

A herd of Buffalo roam in the North Dakota Badlands in Theodore Roosevelt National Park.

Big Bend National Park in remote west Texas is one of the darkest parks in the lower 48 states.

A snorkeler examines the Mandalay shipwreck in Biscayne National Park in Miami.

Fall colors carpet the south rim of the Black Canyon of the Gunnison National Monument.

Distinctive geological structures in an amphitheater at the Bryce Canyon National Park, Utah, are called "Hoodoos."

Sunset lights up the Mesa Arch at Canyonlands National Park in Utah.

A majestic view of Cathedral Valley inside Capitol Reef National Park, Utah.

The nightly exodus of bats from Carlsbad Caverns National Park in New Mexico.

Santa Rosa Island in Channel Islands National Park off the coast of Southern California.

Bald cypress trees grow from the swamp in the Congaree National Park.

Crater Lake National Park is vibrant in the winter covered with snow.

Cuyahoga Valley National Park in Ohio is a short distance from the urban areas of Cleveland and Akron.

Photographers are drawn to Death Valley's Zabriskie Point.

A flightseeing airplane skims along the summit of Mt. Hunter next to Mt. McKinley in the Alaska Range, Denali National Park.

Gorgonian corals are pictured in the Dry Tortugas National Park in Florida.

The tropical wetlands of the Everglades cover more than 700 square miles.

Villagers and visitors walk the dirt road past the Nunamiut store in Anaktuvuk Pass, Alaska. The village, with some 300 residents, is the only community within the Gates of the Arctic National Park.

A snowy sunrise over Lake McDonald in Glacier National Park in Northwest Montana.

Glaciers calve into Glacier Bay in Glacier Bay National Park, Alaska.

Tourists take in the view at the Grand Canyon.

Evergreens blanket Grand Teton National Park.

This night sky image from Great Basin National Park displays the clear, starry night.

Great Sand Dunes National Park is home to the tallest dunes in North America -- over 8,000 feet.

In this photo made by combining 264 20 second exposures, stars leave rings of light behind as they wheel around Polaris, the North Star, over Newfound Gap in the Great Smoky Mountains National Park.

The Appalachian Mountains, shown here at Great Smoky Mountains National Park, have eroded over millions of years. They once towered as high as the Himalayas.

The sun rises above Haleakala National Park in Maui, Hawaii.

Lava from Kilauea volcano in Hawaii Volcanoes National Park enters the Pacific Ocean at dawn.

A geothermal pool is seen in Yellowstone National Park in Wyoming. Yellowstone protects about 10,000 geysers, mudpots, steamvents and hot springs.

Isolated Isle Royale National Park is located in the middle of Lake Superior, Michigan.

Joshua Tree National Park stretches a massive 800,000 acres of high and low desert east of Palm Springs.

A young adult male bear watches intently as other bears fish for salmon, as storm clouds build over Katmai National Park, Alaska in a scene from the motion picture 'Bears.'

Tourists walk to Exit Glacier in Kenai Fjords National Park just outside Seward, Alaska.

Nate Stephenson, research ecologist with the U.S. Geological Survey, stands among millenium-old Sequoias called the Sugarbowl Grove in Redwood Canyon in Kings Canyon National Park.

Visitors of Katmai National Park and Preserve fly can over Lake Clark Pass near Port Alsworth, Alaska.

A standing stone known as the "Devil's Looking Glass" is shown in Mammoth Cave and bears several petroglyphs made by Native American explorers more than 2,000 years ago.

Ancestral Puebloans, Colorado's earliest residents, carved more than 150 rooms into the rock -- a structure known as Cliff Palace in Mesa Verde National Park.

Visitors find seaside scenery and rain forests at Olympic National Park in Washington.

The Petrified Forest National Park in Arizona is rich with ancient artifacts and fossils.

The High Peaks of Pinnacles National Park at sunset.

Ancient coast redwoods tower over visitors to Redwood National Park in California.

Moraine Park at Rocky Mountain National Park filled with a summer bouquet of golden banner and wild iris.

The sun beats down on a saguaro cactus west of Tucson, Ariz. in Saguaro National Park.

General Sherman National Champion Giant Sequoia: the Worlds largest living tree in world at Sequoia National Park in California.

Fog rolls in at Shenandoah National Park.

A buffalo is seen in Theodore Roosevelt National Park outside Watford City, North Dakota.

A beach of the Estate Maho Bay, in the north coast of St. John, part of the U.S. Virgin Islands National Park.

Kab Lake in Voyageurs National Park in Minnesota.

They don't call them the Great Smoky mountains for nothing.

The south rim of the steep-sided canyon carved by the Colorado River in Arizona.

Winter sunset falls over the foothills of the Rocky Mountains in Denver.

Mountain majesty materializes during a tour of Denali National Park in Arkansas.