The highest point of road (at around 1600m) sweeps through a large rock cutting next to an air-traffic control radar installation. Just below here, a track leads off to a fine collection of petroglyphs carved into mountaintop boulders: rudimentary but evocative weathered images chipped out of the stone, including matchstick human figures alongside animals such as gazelle, oryx, Arabian leopards and even what is thought to be a man on an elephant. Further fossils can be seen in the surrounding rocks.
Past the summit, there are sensational views of the road ahead, as it runs along a narrow ridge before descending towards the Rawdah Bowl, plus stomach-churning views into the deep gorge below. En route you’ll pass a remarkable fossil wall, formed out of what was originally a chunk of sea bed rock and covered in a dense layer of fossilized impressions among which the outlines of crabs, starfish and shells can clearly be made out.