Dobby's Frontier Town is an outdoor folk-history museum created from moved and restored buildings. It feels hand-built in the best sense: a post office, church, schoolhouse, shops, and collections arranged to show small-town Nebraska frontier life.
It is not polished like a state museum, but that is part of the charm. Go when it is open, leave time to wander, and treat it as a local passion project rather than a theme park.