A view of the City of London

The City of London is a city and county within London. It is also colloquially known as the Square Mile, as it is 1.12 sq mi (2.90 km2) in area. The City is a major business and financial centre. The City has a resident population of about 7,000 (date from 2011) but over 300,000 people commute to and work there, mainly in the financial services sector.

Fire, bombing and post-World War II redevelopment has meant that the City, despite its history, has relatively few intact notable historic structures. They include the Monument to the Great Fire of London ("the Monument"), St Paul's Cathedral, the Guildhall, the Royal Exchange, Dr. Johnson's House, Mansion House and a great many churches, many designed by Sir Christopher Wren, who also designed St. Paul's.