http://4.bp.blogspot.com/-oYjjelOnTAQ/UMaWk8UkE2I/AAAAAAAAMBg/ePdZbIKvUuY/s1600/emerald-window.jpg
Found by alva on babble.com
Enchanted Forest - Redwood National Park, California, USA
Found by juston on acrookedtrail.blogspot.com