A look at the passage grave at Newgrange, in Ireland, one of the best preserved Neolithic sites of its kind.
With humming, drumming and the playing of `standing waves' to the standing stones, archaeologist Aaron Watson and acoustics expert Dave Keating conduct a range of tests at the site to determine how Neolithic man might have experienced such a monument through sound.
Can sound solve the mysteries of a 5000-year-old Neolithic grave in Ireland?
Can sound solve the mysteries of the 5000-year-old Neolithic grave at Newgrange in Ireland? With Joanna Pinnock. From July 2001.