In our on going quest to find fun weekend stuff to do right here in our home state, we ran across Ringing Rocks Park in Pipestone, Montana. Pipestone is just before Three Forks on I-90.
A description of the area and bit of advice from Roadside America:
A big pile of rocks. Hit them with a hammer, and they ring like bells. Warning: bad roads, and watch for bears.
The drummer in this video not only found the park, but rocked the hell out of the rocks there. Insert corny "this guy rocks" jokes here.

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