Montana has a fascinating -- though slightly uneven -- assortment of state parks. Many of them are recreational sites attached to reservoirs and such, but there are also a number of intriguing historical parks, and a smaller number of really engaging natural wonders. Heading the latter category, of course, is Lewis & Clark Caverns, which was Montana's first state park ... but my favorite is a remote and little-known site way on the opposite end of the state.
This is a shot of Medicine Rocks State Park, just off state highway 7 between Baker and Ekalaka. It's a lovely little oasis in a sea of prairie -- a maze of weirdly-carved rock formations that's fascinating to explore. I spent a September night in the campground there a few years ago, the only person for miles, and it was beautiful and serene and utterly glorious.