precious-postcards

Yellowstone National Park

The vast natural forest of Yellowstone National Park covers nearly 9,000 km2 ; 96% of the park lies in Wyoming, 3% in Montana and 1% in Idaho. Yellowstone contains half of all the world's known geothermal features, with more than 10,000 examples. It also has the world's largest concentration of geysers (more than 300 geyers, or two thirds of all those on the planet). Established in 1872, Yellowstone is equally known for its wildlife, such as grizzly bears, wolves, bison and wapitis.

http://whc.unesco.org/en/list/28

Yellowstone National Park is located in the seismically most active area of the Rocky Mountains and shows globally unparalleled surficial geothermal activity. 

This leads to the existence of 200 species of petrified plants and features like geysers (with 200-250 in number, more than all of the rest of the world combined), hot springs, mud pots and fumaroles. 

Furthermore, the park is the habitat of a great number of grizzly bears. 

http://www.worldheritagesite.org/sites/yellowstone.html