Ringing Rocks of Pennsylvania
This place gives a fresh meaning to the term ‘Rock Concert’. Here — in northern Pennsylvania, not far from the scenic Delaware River — those with a penchant for the inexplicable gather to experience a genuine scientific oddity.
The large rocks that litter the ground here ring like bells when struck. Our advice for anyone planning a visit? Make sure to bring a hammer. Scientists have long studied Pennsylvania’s remarkable Ringing Rocks, but a clear explanation remains elusive.
Make no mistake about it: this is something that shouldn’t be possible. But there’s no question that the rocks here do ring — although not all are audible. It was once thought that just one third of the rocks made their distinctive sound. Yet research in 1965 discovered that all the rocks here ring, but some sound at a pitch that is lower than the human ear can detect. That research didn’t, alas, determine the cause.