On the second day of our trip to Glacier NP, we camped at Lewis and Clark Cavern State Park, White Hall, MT. We had a long drive that day and were lucky to setup our camper just before the thunderstorm.
Next day morning we visited the Caverns near the campground. It was a nice hike and saw a lot of formations - stalactites, stalagmites, columns, and helictites. Most places it was dark where no flash photography was allowed, in some places, they had pure white light shining on them to display the actual colors.
Hike to the cavern entrance from visitor center
Lamp used by the visitors inside the caverns in olden days