The mountains, valleys and Red Sea beaches with turquoise water are known for some of the world's finest diving and attract some, but comparatively few, tourists. Some other spots are hard to reach, such as the Nabatean ruins, a four-hour drive from Medina, the nearest city with an airport for visitors to fly into. The Kingdom is almost totally dependent on oil, a habit Prince Sultan Bin Salman wants to change by forming the Saudi Commission for Tourism & Antiquities in 2000.