Museum of the Fur Trade, on US 20 East of Chadron, built on the site of an old fur trader post. Nice museum with all kinds of artifacts, clothing, the largest collection of "trade guns" anywhere (a couple of hundred). I spent a couple or three hours in there, and could have stayed longer.
http://www.furtrade.org/Founded in 1955, it is in a good sized building with lots of rooms with display cases of everything imaginable having to do with trading, trapping and indians.
If you like the wacky, on St Rt 87 north of Alliance is Carhinge, a Stone Hinge like setting using old automobiles.
I was in the area for the eclipse and was unable to visit Carhinge as it was a huge gathering spot for the eclipse viewers. I ended up a couple of miles north of there.
Camping can be found at Box Butte Reservoir north of Hemmingford off of US385 and also at the Nebraska National Forest on 385 south of Chardron. Chadron has a Wallmart Super Center and good fuel stations if you need anything in that area.
On US26 just north of the North Platte River is the town of Bayard, and there are three RV parking spaces with power pedestals on the east side of the town water tower on E. 11th Street, right across the street from the town park/pool/tennis courts/picnic shelter. Check with City Hall about using the sites, there is a sign posted with info, I seem to recall that one night was free and the next was $10 or the like, not sure now.
It is within sight of Chimney Rock.
Also near Chimney Rock and Bayard is Lake Minatare State Recreation Area with camping, and Scotts Bluff National Monument.
Somewhat southwest of the Fort Robinson State Park is the Agate Fossil Beds National Monument, no camping there however.
Charles
http://www.cityofbayard.net/http://carhenge.com/http://outdoornebraska.gov/lakeminatare/https://www.nps.gov/scbl/index.htmhttps://www.nps.gov/agfo/index.htm