Richard Horwood's PLAN of the Cities of LONDON and WESTMINSTER the Borough of SOUTHWARK, and PARTS adjoining Shewing every HOUSE (1792-99) is used as a base map for markers locating sites depicted in Thomas Malton's A Picturesque Tour through the Cities of London and Westminster, illustrated with the most interesting views executed in aquatinta (1792). Each marker stands for a specific place in London, such as St Paul's Cathedral, represented in aquatints in Malton's Picturesque Tour. This map was created by Matthew Sangster for his research project Romantic London (