Photos: 5,000-Year-Old Scratched Stones Could Be Ancient Maps

Spider webs

Two of the 5,000-year-old "spider stones" unearthed on the Danish island on Bornholm.

(Image credit: Bornholm Museum)
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Tom Metcalfe is a freelance journalist and regular Live Science contributor who is based in London in the United Kingdom. Tom writes mainly about science, space, archaeology, the Earth and the oceans. He has also written for the BBC, NBC News, National Geographic, Scientific American, Air & Space, and many others.