More of a snapshot but thought i would share,
Yes there are many organised tours that can take you up there, its not for the faint hearted though, very narrow, very steep and sheer drop at side of the roads, there are surprisingly various attraction on the rock itself.
Some Impressively BIG caves, the legendary Barbary apes that roam free , war tunnels dug out inside the rock that were used as look out point with there canons & a castle to name just a few