Solar and lunar eclipse diagrams (1830–1839), vintage illustration by L. P. Daniels. Original public domain image from… https://www.rawpixel.com/image/9424837/image-art-vintage-illustrationFree Image from public domain licenseAerial view of Greenbelt, Maryland, taken from Goodyear blimp. Sourced from the Library of Congress. https://www.rawpixel.com/image/12266772/photo-image-cross-road-public-domainFree Image from public domain license