Participants of Meeting on Oil and Natural Gas Exploration and Production Technologies peek through doors in walls during their visit to the deserted city of Dir'iyyah, near Riyadh, January 8, 2008. Dir'iyyah was the capital of the first Saudi state founded in the mid-1700s after the Al-Saud family joined forces with reformist preacher Muhammad bin Abdul Wahab. REUTERS/Ali Jarekji (SAUDI ARABIA)