The AddressingHistory is a website and API which combines data from digitised historical Scottish Post Office Directories (PODs) with contemporaneous historical maps. The website and API were developed by EDINA working in partnership with the National Library of Scotland using materials digitised under an ongoing NLS and Internet Archive programme. In the first instance AddressingHistory focuses on three eras of Edinburgh mapping and Post Office Directories (1784-5; 1865; 1905-6) however the technologies are scalable to the full collection of digitised materials which includes 400 PODs and associated maps covering the whole of Scotland.