Moment of Zen – Great Sand Dunes National Park April 19, 2017 erneill Moment of Zen, Mountain, Photography Great Sand Dunes National Park in Colorado. The tallest dunes in the States near sunset. Share this:ShareClick to email this to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on Pinterest (Opens in new window)