A party from Discovery II at Little America. (1935-1936) by Alfred Saunders. https://www.rawpixel.com/image/13027620/party-from-discovery-little-america-1935-1936-alfred-saundersFree Image from public domain licenseSaint Vincent de Paul receiving supplications from mothers; below, a procession approaches a church. Line engraving by L.… https://www.rawpixel.com/image/14008628/image-cloud-cartoon-personFree Image from public domain licenseGray rocky mountainside in Eibsee. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3288211/free-photo-image-adventure-aircraft-airlinerFree Image from public domain licenseAnchor (c. 1870 - c. 1885) by Joseph Norris and J Wright and Co https://www.rawpixel.com/image/13753336/anchor-c-1870-1885-joseph-norris-and-wright-andFree Image from public domain licenseThe silhouette of a passenger plane in the sky with sun breaking through heavy clouds above and a city below. Original… https://www.rawpixel.com/image/3289108/free-photo-image-aeroplane-airplaine-animalFree Image from public domain licenseYosemite Valley, United States. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3294306/free-photo-image-abies-adventure-aircraftFree Image from public domain licenseAgainst the blue sky. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3289706/free-photo-image-aircraft-airliner-airplaneFree Image from public domain licenseFrans vaandel veroverd in Portugal, 1701-1713 (1713 - 1720) by anonymous https://www.rawpixel.com/image/13746287/frans-vaandel-veroverd-portugal-1701-1713-1713-1720-anonymousFree Image from public domain license