In 2001, the state hosted 7 million overnight visitors and 17.9 million day-trip travelers. Direct spending on travel within the state totaled about $1.82 billion and accounted for 12.7% of total sales tax revenue. The tourism and travel industry supports over 32,300 jobs.
There are two national parks in Wyoming—Yellowstone and Grand Teton—and nine national forests. Devils Tower and Fossil Butte are national monuments, and Fort Laramie is a national historic site. Yellowstone National Park, covering 2,219,791 acres (898,349 hectares), mostly in the northwestern corner of the state, is the oldest (1 March 1872) and largest national park in the US. The park features some 3,000 geysers and hot springs, including the celebrated Old Faithful. Just to the south of Yellowstone is Grand Teton National Park, 309,993 acres (125,454 hectares).
Adjacent to Grand Teton is the National Elk Refuge, the feeding range of the continent's largest known herd of elk. Devils Tower, a rock formation in the northeast, looming 5,117 feet (1,560 meters) high, is the country's oldest national monument (24 September 1906).