The ICESCAPE mission, or "Impacts of Climate on Ecosystems and Chemistry of the Arctic Pacific Environment," near Alaska.… Free Image from public domain license 
Sand dunes in Southern California. Original image from Carol M. Highsmith’s America, Library of Congress collection.… Free Image from public domain license 
The Soyuz MS-02 spacecraft is seen as it lands with Expedition 50 near the town of Zhezkazgan, Kazakhstan, April 10, 2017.… Free Image from public domain license 
Beautiful photomechanical prints of Lotus Flowers (1887–1897) by Ogawa Kazumasa. Original from The Rijksmuseum.… Free Image from public domain license 