Traveler's Rest State Park

The Lewis & Clark Expedition, also known as the Corps of Discovery, camped at this location from September 9-11, 1805 and then again on June 30-July 3, 1806. It was declared a National Historic Landmark in 1960 and listed on the National Register of Historic Places in 1966. Travelers' Rest State Park is the only archaeologically-verified campsite of the Expedition. It was also a place where Indigenous people camped, gathered resources, and met for trade and fellowship. The park features a trail with interpretive panels describing the Expedition, the wildlife, and the original inhabitants of the land. The Visitor Center includes exhibits of archaeological finds, Indigenous history and culture, and a hands-on area for young children.

When the site was declared a national landmark, it was actually off by a mile and half. Studies in the early 1980s and later early 2000s (coinciding with the excavations) finally established the correct location of the campsite and the boundaries of the park. 

https://en.wikipedia.org/wiki/Traveler%27s_Rest_(Lolo,_Montana) http://www.visitmt.com/listings/general/state-park/travelers-rest-state-park.html