Al Naslaa Rock is the most photogenic petroglyph in Tayma about an eight-hour drive out of Riyadh, Saudi Arabia.. The uniform slit between the two standing stones and the flat faces are completely natural. A perfect slit between the rocks seems like a machine work, but it is astonishingly natural. The small pedestals have provided additional support to boulders. Archaeologists don’t know how rock formation remains balanced and how did the rock cut in the middle. Most likely movement in the ground below triggered the split but the exact cause of the split has yet to be determined .