Person wearing headlight facing towards snow mountains. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284894/free-photo-image-road-space-night-skyFree Image from public domain licenseSand dunes in Southern California. Original image from Carol M. Highsmith’s America, Library of Congress collection.… https://www.rawpixel.com/image/434101/pink-sand-dunesFree Image from public domain licenseFree gradient color splash photo, public domain texture CC0 image. https://www.rawpixel.com/image/5923662/photo-image-background-texture-public-domainFree Image from public domain licenseAutumnal view of Rocky Mountain peaks called the Maroon Bells, between Pitkin County and Gunnison County, Colorado. Original… https://www.rawpixel.com/image/422056/rocky-mountain-peaksFree Image from public domain licensePacific Coast Sunset at Monterey, California. Original image from Carol M. Highsmith’s America, Library of Congress… https://www.rawpixel.com/image/434134/monterey-californiaFree Image from public domain licenseStill Life with Flowers (c. 1625 - c. 1630) by Balthasar van der Ast https://www.rawpixel.com/image/13731947/still-life-with-flowers-c-1625-1630-balthasar-van-der-astFree Image from public domain licenseLady Bird Johnson Grove in Northern California. Original image from Carol M. Highsmith’s America, Library of Congress… https://www.rawpixel.com/image/422019/lady-bird-johnson-groveFree Image from public domain licenseNASA Astronaut Stands on Mars (2020) illustrated by NASA/JPL-Caltech. Original public domain image from Wikimedia Commons.… https://www.rawpixel.com/image/10184729/image-astronaut-sunset-personFree Image from public domain licenseThe "Human Squirrel" who did many daring "stunts" in climbing for benefit of War Relief Funds in New York City. He is shown… https://www.rawpixel.com/image/8799893/photo-image-vintage-smoke-public-domainFree Image from public domain licenseMountain-sunset view from Telluride, once a mining boomtown and now a popular skiing destination in Colorado. Original image… https://www.rawpixel.com/image/434426/mountain-sunset-viewFree Image from public domain licenseA turtle glides through the water at the Texas State Aquarium in Corpus Christi. Original image from Carol M.… https://www.rawpixel.com/image/422049/sea-turtleFree Image from public domain licenseScarborough, New Zealand. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3282346/free-photo-image-mental-health-woman-tirednessFree Image from public domain licenseLocated in the southeast corner of California, the Imperial Sand Dunes are the largest mass of sand dunes in the state.… https://www.rawpixel.com/image/422008/the-imperial-sand-dunesFree Image from public domain licenseA lush field beneath threatening skies in rural Otero County, Colorado. Original image from Carol M. Highsmith’s… https://www.rawpixel.com/image/422045/green-meadow-fieldFree Image from public domain licenseThe Redwood National and State Parks. Original image from Carol M. Highsmith’s America, Library of Congress… https://www.rawpixel.com/image/422014/tree-canopyFree Image from public domain licenseA mixed herd of wild and domesticated horses frolics on the Ladder Livestock ranch, at the Wyoming-Colorado border. Original… https://www.rawpixel.com/image/434464/wild-mustang-horsesFree Image from public domain licenseSumatran Tiger (2009) by Mehgan Murphy. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3060411/free-photo-image-tiger-forest-animalFree Image from public domain licenseYosemite National Park, United States. Original image from Carol M. Highsmith’s America, Library of Congress… https://www.rawpixel.com/image/422042/yosemite-national-parkFree Image from public domain licenseRock Creek Park, Washington, D.C. Original image from Carol M. Highsmith’s America, Library of Congress collection.… https://www.rawpixel.com/image/421726/rock-creek-parkFree Image from public domain licenseFree gradient blue painting texture background image, public domain CC0 photo. https://www.rawpixel.com/image/5923841/photo-image-background-texture-public-domainFree Image from public domain licenseBirch trees in Utah high country. Original image from Carol M. Highsmith’s America, Library of Congress collection.… https://www.rawpixel.com/image/433988/birch-trees-utahFree Image from public domain licenseRed-eyed Tree Frog (Agalychnis callidryas), photographed near Playa Jaco in Costa Rica (retouched version). Original public… https://www.rawpixel.com/image/3339343/free-photo-image-frog-tree-public-domainFree Image from public domain licenseYosemite National Park. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally… https://www.rawpixel.com/image/422023/yosemite-national-parkFree Image from public domain licenseThe setting sun paints the clouds over NASA's Kennedy Space Center in Florida. Original from NASA. Digitally enhanced by… https://www.rawpixel.com/image/440893/setting-sunFree Image from public domain licenseMaple leaf bookmark. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283956/free-photo-image-autumn-book-page-textFree Image from public domain licenseRose Flower. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3338329/free-photo-image-botanical-cc0-creative-commonsFree Image from public domain licenseThe majestic peaks of the Teton Range reflect in a mountain stream in Grand Teton National Park in northwestern Wyoming.… https://www.rawpixel.com/image/434429/the-teton-rangeFree Image from public domain licenseA red fox prowls for voles, hidden beneath the snow, in Yellowstone National Park in the western U.S. state of Wyoming.… https://www.rawpixel.com/image/422046/fox-the-snowFree Image from public domain licenseFree green botanical landscape image, public domain landscape CC0 photo. https://www.rawpixel.com/image/5923135/photo-image-light-public-domain-treesFree Image from public domain licenseClose-up of a pastel pink gerbera flower. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284117/free-photo-image-flower-pink-flowers-gerberaFree Image from public domain licenseBouquet (1940–1949), vintage flower still life by Stefan Polkorab. Original public domain image from Web Umenia. … https://www.rawpixel.com/image/11066480/image-rose-flower-plantFree Image from public domain licenseThe Maroon Bells, just outside Aspen in Colorado's Rocky Mountains USA - Fall aspens in San Juan County, Colorado USA -… https://www.rawpixel.com/image/434477/the-maroon-bellsFree Image from public domain licenseA red fox prowls for voles, hidden beneath the snow, in Yellowstone National Park in the western U.S. state of Wyoming.… https://www.rawpixel.com/image/434437/fox-the-snowFree Image from public domain licenseSlot Canyons. Gently carved from the Navajo sandstone over the course of countless millenniums. Original image from Carol M.… https://www.rawpixel.com/image/421720/slot-canyonsFree Image from public domain licenseJellyfish. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286038/free-photo-image-jellyfish-creative-commons-animalFree Image from public domain licenseRistolochia Clematitis (Birthwort) enlarged 8 times,Hyoscyamus Niger (Henbane) enlarged 10 times,and Aristolochia Clematitis… https://www.rawpixel.com/image/2222821/karl-blossfeldt-macrophotographyFree Image from public domain licensePromotional image from Godzilla Raids Again. Anguirus left, Godzilla right (1955) by Toho Company Ltd. Original public… https://www.rawpixel.com/image/10541359/image-people-art-skyFree Image from public domain licenseLions in the grass at the Wild Animal Sanctuary near Keenesburg, Colorado. Original image from Carol M. Highsmith’s… https://www.rawpixel.com/image/422129/wild-lionsFree Image from public domain licenseA portion of Great Sand Dunes National Monument and Preserve. Original image from Carol M. Highsmith’s America… https://www.rawpixel.com/image/434577/pink-sand-dunesFree Image from public domain licenseHorses head for the corral in the daily roundup of horses, Riverside, Wyoming. Original image from Carol M.… https://www.rawpixel.com/image/422112/horses-fieldFree Image from public domain licenseInfantry combat scene in Bougainville, France (1914). Original image from National Museum of Health and Medicine. Digitally… https://www.rawpixel.com/image/2298620/free-photo-image-war-vintage-soldierFree Image from public domain licenseDouble rainbows and cloudy sky in autumn. Original public domain image from Flickr https://www.rawpixel.com/image/4021513/photo-image-wallpaper-tree-rainbowFree Image from public domain licenseBody of water. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286130/free-photo-image-ocean-under-water-green-blueFree Image from public domain licenseFree abstract green exposure background image, public domain CC0 photo. https://www.rawpixel.com/image/5925882/photo-image-background-texture-aestheticFree Image from public domain licenseStill Life with Flowers and a Watch (c. 1660 - c. 1679) by Abraham Mignon https://www.rawpixel.com/image/13731577/still-life-with-flowers-and-watch-c-1660-1679-abraham-mignonFree Image from public domain licenseThe Linn Cove Viaduct, a 1243-ft. concrete segmental bridge on the Blue Ridge Parkway, near Linville, North Carolina.… https://www.rawpixel.com/image/422110/the-linn-cove-viaductFree Image from public domain licenseImage of Europe, Africa, and the Middle East at night. Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/418610/earth-dark-sideFree Image from public domain licenseClose-up of a monarch butterfly on orange flowers. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284630/free-photo-image-butterfly-flower-beeFree Image from public domain licenseA woman taking photos of a lake, surrounded by trees with orange and yellow leaves in herastrau park. Original public domain… https://www.rawpixel.com/image/3336888/free-photo-image-park-landscape-photography-fall-lakeFree Image from public domain licenseGray Wolf (2012) by Brittany Steff. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3062723/free-photo-image-wolf-background-animalFree Image from public domain licenseStill Life with a Vase of Flowers and a Dead Frog (1634) by Jacob Marrel https://www.rawpixel.com/image/13733056/still-life-with-vase-flowers-and-dead-frog-1634-jacob-marrelFree Image from public domain licenseRed Siskin (2016). Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3060401/free-photo-image-bird-animal-zooFree Image from public domain licenseGlacier National Park, Montana. Original image from Carol M. Highsmith’s America, Library of Congress collection.… https://www.rawpixel.com/image/3090585/free-photo-image-lake-forest-natureFree Image from public domain licenseFree colorful sheep on snow image, public domain animal CC0 photo. https://www.rawpixel.com/image/5922160/photo-image-background-public-domain-natureFree Image from public domain licenseSeascape (c.1910s) photography in high resolution. Original from the Saint Louis Art Museum. https://www.rawpixel.com/image/7614826/image-paper-vintage-artFree Image from public domain licenseThis image shows a layered deposit in Galle Crater, located in the Southern cratered highlands. Original from NASA.… https://www.rawpixel.com/image/440588/layered-deposit-galle-craterFree Image from public domain licenseEarth observations taken from Mir Space Station during NASA 7 mission. Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/440480/earth-observationFree Image from public domain licenseHay bales are as numerous as the trees in this stretch of rural Nebraska. Original image from Carol M. Highsmith’s… https://www.rawpixel.com/image/3093970/free-photo-image-view-summer-nebraskaFree Image from public domain licenseThe land as seen from the extended pier across the sea under a starry night.. Original public domain image from Wikimedia… https://www.rawpixel.com/image/3285199/free-photo-image-star-mountain-sea-oceanFree Image from public domain licenseThe Mackenzie River in the Northwest Territories, Canada. Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/439973/map-green-terrain-canadaFree Image from public domain licenseMount McKinley or Denali ("The Great One") in Alaska. Original image from Carol M. Highsmith’s America, Library of… https://www.rawpixel.com/image/421725/mount-mckinleyFree Image from public domain licenseDying Poplar and Live Branch - Lake George (1932) photo in high resolution by Alfred Stieglitz. Original from the Getty.… https://www.rawpixel.com/image/3813998/photo-image-tree-art-botanicalFree Image from public domain licenseHeilongjiang, a province of China located in the northeastern part of the country. Original from NASA. Digitally enhanced by… https://www.rawpixel.com/image/440587/heilongjiang-province-space-viewFree Image from public domain licenseMountain ridges showing the distinctive geology of the Geikie Plateau region in eastern Greenland. Original from NASA.… https://www.rawpixel.com/image/440139/the-geikie-plateauFree Image from public domain licenseAerial view of Central Park, New York. Original image from Carol M. Highsmith’s America, Library of Congress… https://www.rawpixel.com/image/433919/central-parkFree Image from public domain licenseCalifornia Coastline. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally… https://www.rawpixel.com/image/421875/california-coastlineFree Image from public domain licenseOwl perched on a rock. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally… https://www.rawpixel.com/image/3093819/free-photo-image-america-animals-snow-birdFree Image from public domain licenseSmall totara tree on ridge above Long Point, Porirua Harbour bent towards the south-east by the prevailing north-westerly… https://www.rawpixel.com/image/13029755/photo-image-public-domain-black-and-white-gren-photographyFree Image from public domain licenseWater lily. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3337989/free-photo-image-flower-botanical-flowers-lotusFree Image from public domain licenseA Sally Lightfoot Crab (Grapsus grapsus) in the Galapagos. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3339353/free-photo-image-crab-sea-animalsFree Image from public domain license