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Ringing Rocks Park

215-348-6114

The Mystery: Deep in the woods in this 128-acre park is a large field of mysterious boulders that, when struck, sound like bells, as if they are hollow and made of metal. Each summer, hundreds of visitors flock here, hammers in hand, to perform their own "rock concerts."

Fact: While scientists have determined the stones are made from a volcanic substance called diabase, there's no explanation for their unusual ringing properties, nor for the eight-acre field itself, which is situated high on a hillside, not at the bottom, ruling out that it may have been formed by a glacier or avalanche.

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