Rocks, the main attraction on any trip to Moab, hold appeal for archaeology buffs young and old. This seemingly harsh and inhospitable land has been inhabited for hundreds if not thousands of years. And the area's early inhabitants have left their mark. The evidence is on the rock. Paleo-Indian flints and rock piles may be visible to the well-trained eye only. But Moab petroglyphs etched in canyon walls are detectable by everyone. How many images can you identify at this outdoor art museum?