In pictures: Egypt's hidden treasures

Egypt's western desert shelters a treasure trove of prehistoric cave paintings.

New sites dating back more than seven thousand years are still being found in the ancient Gilf Kebir plateau, near the border with Sudan and Libya.

This painting in the Mestekawi Cave was found in 2002 and is the most recent discovery.

Photographer Mohamed El Hebeishy says some sites are being destroyed by tourists who spray water onto the art to bring out the colours for photos.