Egyptian pyramids found by infra-red satellite images
Seventeen lost pyramids are among the buildings identified in a new satellite survey of Egypt.
More than 1,000 tombs and 3,000 ancient settlements were also revealed by looking at infra-red images which show up underground buildings.
Initial excavations have already confirmed some of the findings, including two suspected pyramids.
The research led by Dr Sarah Parcak from the University of Alabama at Birmingham features in a BBC documentary, Egypt's Lost Cities on BBC One on Monday 30 May at 2030 BST. It will also be shown on the Discovery channel in the US.
25 May 2011