Yellowstone Park.

The Yellowstone National Park

Many of the wonders of Rocky mountains can be observed, the Yellowstone National Park .
this park is located in the western corner of Wyoming.
Yellow Stone was established in 1872, is the oldest national park in the world and one of the largest of USA.
Yellowstone is also the largest wildlife preserve is a place where wild animals are proctected by law.
Yellowstone National Park is a national park located in the U.S. states of Wyoming, Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872.^[4][5] Yellowstone was the first National Park in the U.S. and is also widely held to be the first national park in the world.^[6] The park is known for its wildlife and its many geothermal features, especially Old Faithful Geyser, one of its most popular features.^[7] It has many types of ecosystems, but the subalpine forest is the most abundant. It is part of the South Central Rockies forests ecoregion. 
The park is at the headwaters of the Yellowstone River, from which it takes its historical name. Near the end of the 18th century, French trappers named the river Roche Jaune, which is probably a translation of the Hidatsa name Mi tsi a-da-zi ("Rock Yellow River").^[13] Later, American trappers rendered the French name in English as "Yellow Stone". Although it is commonly believed that the river was named for the yellow rocks seen in the Grand Canyon of the Yellowstone, the Native American name source is unclear.^[14]

The human history of the park begins at least 11,000 years ago when Native Americans began to hunt and fish in the region. During the construction of the post office in Gardiner, Montana, in the 1950s, an obsidian projectile point of Clovis origin was found that dated from approximately 11,000 years ago.^[15] These Paleo-Indians, of the Clovis culture, used the significant amounts of obsidian found in the park to make cutting tools and weapons. Arrowheads made of Yellowstone obsidian have been found as far away as the Mississippi Valley, indicating that a regular obsidian trade existed between local tribes and tribes farther east.^[16] By the time white explorers first entered the region during the Lewis and Clark Expedition in 1805, they encountered the Nez Perce, Crow, and Shoshone tribes. While passing through present day Montana, the expedition members heard of the Yellowstone region to the south, but they did not investigate it.^[16]