NPS.gov (America's National Park Service) is Celebrating 100 Years (Happy Birthday!).
Join the Party with Free Admission to ALL 412 USA National Parks from August 25 through August 28 2016.
For the Full List of Events in the National Parks: http://findyourpark.com/find#centennial_events
Here are the Top 10 Most Popular National Parks in America:
1. Great Smoky Mountains (Tennessee, North Carolina):
The Great Smoky Mountains, part of the Appalachian Mountains, span a wide range of elevations, making them home to over 400 vertebrate species, 100 tree species, and 5000 plant species. Hiking is the park's main attraction, with over 800 miles (1,300 km) of trails, including 70 miles (110 km) of the Appalachian Trail. Other activities include fishing, horseback riding, and touring nearly 80 historic structures.
Source: Wikipedia, Photo Credit: I, Blinutne [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.5-2.0-1.0], via Wikimedia Commons
2. Grand Canyon (Arizona)
The Grand Canyon, carved by the mighty Colorado River, is 277 miles (446 km) long, up to 1 mile (1.6 km) deep, and up to 15 miles (24 km) wide. Millions of years of erosion have exposed the colorful layers of the Colorado Plateau in countless mesas and canyon walls, visible from both the north and south rims, or from a number of trails that descend into the canyon itself.
Source: Wikipedia, Photo Credit: Luca Galuzzi [CC BY-SA 2.5], via Wikimedia Commons
3. Rocky Mountain (Colorado)
Bisected north to south by the Continental Divide, this portion of the Rockies has ecosystems varying from over 150 riparian lakes to montane and subalpine forests to treeless alpine tundra. Wildlife including mule deer, bighorn sheep, black bears, and cougars inhabit its igneous mountains and glacier valleys. Longs Peak, a classic Colorado fourteener, and the scenic Bear Lake are popular destinations, as well as the famous Trail Ridge Road, which reaches an elevation of more than 12,000 feet (3,700 m).
Source: Wikipedia, Photo Credit: By User:K.lee (Own work) [GFDL or CC BY-SA 4.0-3.0-2.5-2.0-1.0], via Wikimedia Commons
4. Yosemite (California)
Among the earliest candidates for National Park status, Yosemite features towering granite cliffs, dramatic waterfalls, and old-growth forests at a unique intersection of geology and hydrology. Half Dome and El Capitan rise from the park's centerpiece, the glacier-carved Yosemite Valley, and from its vertical walls drop Yosemite Falls, North America's tallest waterfall. Three giant sequoia groves, along with a pristine wilderness in the heart of the Sierra Nevada, are home to an abundance of rare plant and animal species.
Source: Wikipedia, Photo Credit: By user:AngMoKio (Own work (Original text: selfmade photo)) [CC BY-SA 2.5], via Wikimedia Commons
5. Yellowstone (Wyoming, Montana, Idaho)
Situated on the Yellowstone Caldera, the park has an expansive network of geothermal areas including vividly colored hot springs, boiling mud pots, and regularly erupting geysers, the best-known being Old Faithful and Grand Prismatic Spring. The yellow-hued Grand Canyon of the Yellowstone River has a number of scenic waterfalls, and four mountain ranges run through the park. More than 60 mammal species including gray wolves, grizzly bears, lynxes, bison, and elk, make this park one of the best wildlife viewing spots in the country.
Source: Wikipedia, Photo Credit: Brocken Inaglory [CC BY-SA 3.0 or GFDL], via Wikimedia Commons
6. Zion (Utah)
Located at the junction of the Colorado Plateau, Great Basin, and Mojave Desert, this geological wonder has colorful sandstone canyons, mountainous mesas, and countless rock towers. Natural arches and exposed plateau formations compose a large wilderness roughly divided into four ecosystems: desert, riparian, woodland, and coniferous forest.
Source: Wikipedia, Photo Credit: By Diliff (taken by Diliff) [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.5-2.0-1.0], via Wikimedia Commons
7. Olympic (Washington)
Situated on the Olympic Peninsula, this park straddles a diversity of ecosystems from Pacific shoreline to temperate rainforests to the alpine slopes of Mount Olympus. The scenic Olympic Mountains overlook the Hoh Rain Forest and Quinault Rain Forest, the wettest area in the continental United States.
Source: Wikipedia, Photo Credit: By No machine-readable author provided. KevinM~commonswiki assumed (based on copyright claims). [GFDL or CC-BY-SA-3.0], via Wikimedia Commons
8. Grand Teton (Wyoming)
Grand Teton is the tallest mountain in the Teton Range. The park's historic Jackson Hole and reflective piedmont lakes teem with unique wildlife and contrast with the dramatic mountains, which rise abruptly from the sage-covered valley below.
Source: Wikipedia, Photo Credit: By Daniel Mayer (Own work) [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.5-2.0-1.0], via Wikimedia Commons
9. Acadia (Maine)
Covering most of Mount Desert Island and other coastal islands, Acadia features the tallest mountain on the Atlantic coast of the United States, granite peaks, ocean shoreline, woodlands, and lakes. There are freshwater, estuary, forest, and intertidal habitats.
Source: Wikipedia, Photo Credit: By BobLeChat at English Wikipedia (Own work) [Public domain], via Wikimedia Commons
10. Glacier (Montana)
The U.S. half of Waterton-Glacier International Peace Park, this park hosts 26 glaciers and 130 named lakes beneath a stunning canopy of Rocky Mountain peaks. There are historic hotels and a landmark road in this region of rapidly receding glaciers. The local mountains, formed by an overthrust, expose the world's best-preserved sedimentary fossils from the Proterozoic era.
Source: Wikipedia, Photo Credit: By Jon Sullivan [Public domain], via Wikimedia Commons