A walk discovering the 'square mile' - the origins of London 2000 years ago, from the arrival of the Romans through medieval times, The Great Fire of London, the architecture of Sir Christopher Wren to the latest buildings of the 21st. century. This is the commercial heart of London. The business centre during the week much quieter at the weekend. The walk includes the latest development of Paternoster Square adjacent to the cathedral now home to the Stock Exchange. The tour can finish in the wonderfully clean St Paul's Cathedral.