Pyramids' build clues uncovered by Newport engineer
17 December 2013 Last updated at 08:45 GMT
An engineer from Newport says he can prove pyramids were not built as engineers across the world have believed.
Peter James has worked in Egypt for 18 years and his team of engineers have been restoring some of the ancient structures, including one which is over 4,000 years old.
He told the BBC Wales' economics correspondent Sarah Dickins about his work and how he believed the pyramids were constructed.