The work of legendary nature photographer John Fielder has taken him to pockets of untouched Colorado land that most of us can only imagine. This frozen tarn in Mount Zirkel Wilderness Area, which brilliantly reflects the pink clouds above, is one such spot. In honor of the Wilderness Act, which has protected millions of acres of American land like this since 1964, Fielder supplied this photo and others for a 50th Anniversary Wilderness Act Poster.

—Image courtesy of the artist