Plate 131 from The Plan of Chicago, 1909: Chicago. Elevation Showing the Group of Buildings Constituting the Proposed Civic… https://www.rawpixel.com/image/8937646/image-paper-pattern-skyFree Image from public domain licenseNight starry sky background https://www.rawpixel.com/image/11731155/night-starry-sky-backgroundView licenseGalaxy planets frame background, cute space illustration https://www.rawpixel.com/image/11731156/galaxy-planets-frame-background-cute-space-illustrationView licenseA medieval ship flag captured from a Danish ship by forces from Lübeck in 1427 displaying the arms of Denmark, Sweden… https://www.rawpixel.com/image/8324950/image-art-vintage-public-domainFree Image from public domain license