1 Best Sight in Helena, Bozeman, and Southwest Montana, Montana

The Lewis and Clark Caverns, Montana's oldest state park, hold some of the most beautiful underground landscapes in the nation. Two-hour tours lead through narrow passages and vaulted chambers past colorful, intriguingly varied limestone formations. The temperature stays in the 50s year-round; jackets and rubber-sole shoes are recommended. Note that the hike to the cavern entrance is mild. A campground sits at the lower end of the park.