Never Sleeping Wall - near of San Vito lo Capo (on this link you have practical info about climbing in San Vito Lo Capo) - is fantastic climbing wall. Overhanging and up to 90 m wall, with long routes (the longest has 57 meters). Climbing here is probably the best in Sicily: amazing tufa climbs, long overhang, big holds, stamina climbing. Grades from 6a to 8a+. Definitely if you do just 6b then you must go here.