Hidden gems: America's 20 least-visited National Monuments
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9. Hagerman Fossil Beds, Idaho( Nicholas D. )
Thanks to a tip from an Idaho farmer in the 1930s, archaeologists discovered the largest collection of Hagerman horse fossils in what is now Hagerman Fossil Beds National Monument, about 90 minutes from Boise. (A Hagerman horse is a zebra-like creature native to North America that has been extinct for millions of years.) They also found fossil deposits of more than 220 species of plants and animals, some dating back 4 million years. Bonus: A part of the Historic Oregon Trail, the historic wagon route to the Pacific Northwest, runs through the southern part of the park.
Visitors in 2009: 27,263
More info: http://www.nps.gov/archive/hafo/information.htm