On our way to Yellowstone and it was getting late in the day, seen signs for the Old Montana Prison and decided that would be a fun stop. Pulled in and note on office door said to find a site and could either pay in the drop box or in the morning. Sites were pretty level and we had a nice grass area around our picnic table. The snow capped mountains were a nice touch. Only downside was the freeway but it wasn’t a problem. Staff was very friendly and facilities were clean. I plan on stopping here again, I’m interested in seeing the Grant-Kohrs ranch.