wetterloch - watterloch or small cave in the bannwald above lungern in the canton of obwalden in switzerland

switzerland waetterloch underground stalactites stalagmites wetterloch watterloch background stalactite stalagmite attraction landscape adventure limestone formation undefined bannwald obwalden oberhalb mountain entrance darkness lungern schweiz graphic drawing natural tourism geology tourist ancient outdoor scenery glowing outside canton kleine hoehle design travel nature yellow ground tunnel cavern caving small caves water light green black earth night stone scene cave oder rock clip dark deep hole art