Petroglyphs and a waterfall among the many treasures you’ll discover on the short, easy hike to Keyhole Sink near Flagstaff Keyhole Sink is a unique site near Flagstaff with petroglyphs and a seasonal waterfall that’s fairly easy to get to. Sharing is caringClick to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)MoreClick to email a link to a friend (Opens in new window)Like this:Like Loading...