UnexplainedEarth: Ringing Rocks of Pennsylvania

In Upper Black Eddy, Pennsylvania lies a field of boulders that just won't keep quiet. Known as Ringing Rocks Park, this jumble of enigmatic stones has perplexed researches for decades because of the melodious tones the rocks produce when struck with a hammer or any solid instrument. But ringing rocks aren't the only unexplained things at this site.

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