Crimson and ochre granite soars above an impossibly blue alpine lake as Little Matterhorn and Notch Top Mountain pierce a cloud-dusted Colorado sky — this stunning white-border scenic of Rocky Mountain National Park's Odessa Lake, shot at 10,000 feet elevation, is a masterpiece of early national park promotional photography, published by Sanborn Souvenir Co. of Denver. The card was never mailed, preserving its crisp, unwritten reverse with a lovely printed description of the Odessa and Fern Lakes trip that reads almost like a travel brochure. Rocky Mountain National Park, established in 1915, was drawing increasing numbers of automobile tourists by the early 1920s, and Sanborn's cards were prized souvenirs of the journey.