Unique/unusual place to stay between Bozeman and Missoula?

After moving out of state for a while, I’m planning a trip home to MT and want to explore as if I’d never been there. What are some fun / unique / unusual places to stay between Bozeman & Missoula?

Boulder HS is on my list, but I’ve been there several times before (Fairmont too). Trying to go somewhere new to me & maybe unusual.

Maybe a hot spring or near a sapphire mine?