The New Encyclopedia Britannica: Micropaedia, Location unknown, 04/02/2017. https://www.rawpixel.com/image/6113734/photo-image-book-public-domain-freeFree Image from public domain licenseFamous British landmark vintage illustration wall art print and poster design remix from original artwork. https://www.rawpixel.com/image/2267303/premium-illustration-image-architecture-poster-vintageView licenseArchitecture: St. Paul and St. Peters Cathedral from the book, Encyclopaedia Britannica 9th edition (1875), illustration of… https://www.rawpixel.com/image/428209/st-paul-and-st-peters-cathedralFree Image from public domain license