Things to Do Natural Wonders Lava Columns Look Like Rock Fence Posts in Yellowstone “YS-ColumnarBasalt-NorthTowerFall_NPSDianeRenkin_700” "NPS/Diane Renkin" Share this Facebook Icon Twitter Icon Email Icon Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In