The final stop on our six-day Montana road trip was quite possibly the most bizarre place I’ve ever been in my life: Ringing Rocks. Which is – as the name suggests – a collection of rocks that ring… when hit with a hammer, that is. It’s not entirely clear why this happens. Geologists think it has something to do with the composition of the boulders and the way they are all piled up together. If you remove a rock from the pile, it will no longer ring.