Yellowstone National Park USA facts Yellowstone National Park established in 1872 is the first national park in the world spanning 34684 sare Miles 8,983 Square km across Wyoming Montana and Idaho it sits a top a super volcano which fuels over 10,000 geothermal features including the famous Old Faithful Geyser the park is home to diverse Wildlife including grizzly bears wolves bison and Elk thriving within its various ecosystems from Lush forests to Alpine Rivers Yellowstone is known for its stunning Landscapes like the Grand Canyon of the Yellowstone with its powerful waterfalls the Park's history includes the conservation efforts led by early Park Rangers and Native American tribes who inhabited the region for thousands of years today it remains a UNESCO world heritage site attracting millions of visitors annually