Historical Marker
The Experiment
Historical marker location:
4201 Giant Springs Road, Great Falls, Montana
( Marker can be reached from Giant Springs Road near River Drive North, on the left when traveling east.)
The town of Philipsburg, Montana, is known for its sapphire mining, with some of the best sapphires in the world being found in the surrounding mountains. Visitors can go gemstone hunting and visit the local sapphire museum to learn about the history of mining in the area.