St Pancras Smallpox Hospital, London: housed in a tented camp at Finchley. Watercolour by F. Collins, 1881. https://www.rawpixel.com/image/13965397/image-cloud-plant-personFree Image from public domain licenseTennessee mountain landscape background, vintage nature illustration by Adolph G. Metzner. Remixed by rawpixel. https://www.rawpixel.com/image/9824788/image-background-art-watercolorView licenseBelegering van Casale Monferrato (1693 - 1717) by Wenceslaus Hollar, Frederik de Wit and Anna Beeck https://www.rawpixel.com/image/13767790/image-paper-cartoon-frameFree Image from public domain license