Most popular sport climbing area in Malta. Crowded (by Maltese standards) on Sundays but never full up.
Buses 138 and 38 stop at Blue Grotto, just West of Wied Babu. From the stop, head East toward the valley about 450 m until you see a metal staircase behind the fence on the right. Jump over the fence, down the staircase, and follow the path into the valley.