Two Men Contemplating the Moon by Caspar David Friedrich https://www.rawpixel.com/image/9612696/two-men-contemplating-the-moon-caspar-david-friedrichFree Image from public domain licenseSunburst in the Riesengebirge (1835) painting in high resolution by Caspar David Friedrich. https://www.rawpixel.com/image/7728727/image-art-public-domain-artworksFree Image from public domain licenseStatue of the Madonna in the Mountains by Caspar David Friedrich https://www.rawpixel.com/image/8968095/statue-the-madonna-the-mountains-caspar-david-friedrichFree Image from public domain licenseCorner of the Meadow with Reeds and Other Plants by Adrian Zingg https://www.rawpixel.com/image/8977979/corner-the-meadow-with-reeds-and-other-plants-adrian-zinggFree Image from public domain licenseWoman with Spider's Web Between Bare Trees by Caspar David Friedrich https://www.rawpixel.com/image/8969426/woman-with-spiders-web-between-bare-trees-caspar-david-friedrichFree Image from public domain license