About half way down George IV Bridge between the Old Town and the University of Edinburgh, you’ll find the National Library of Scotland, a category A-listed building.
Built between 1938 and 1956 (with the interruption of the Second World War in between), the library has since expanded into a more modern building on the south side of the city centre on Causewayside. It’s home to Shakespeare’s First Folio, copies of the Gutenburg Bible and the actual letter Charles Darwin submitted with the manuscript of the Origins of Species, amongst its seven million books and 14 million printed items.