Known as "thunderstones" and made from flint and other fire-starting rock, mysterious stones shaped like axe heads have often been found in Viking-age graves. Because they dated back thousands of years, they were once believed to be random artifacts, possibly mixed in with newer gravesites by accident. Now archaeologists theorize that these stones were treasured items that were deliberately placed in graves for the departed to take into the next life.
Find out more about these intriguing artifacts in the article by Kate Ravilious at National Geographic News.
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