Greater London is often referred to as "the City" or "the Square Mile" and it forms the main financial district. Archaically, the urbanised area of London was known as the Metropolis. In common usage, the terms "London" and "Greater London" are usually used interchangeably. Greater London is officially divided for some purposes, with varying definitions, into Inner London and Outer London. For some strategic planning purposes it is divided into five sub-regions. Greater London is under the strategic local governance of the Greater London Authority (GLA). It consists of an elected assembly, the London Assembly, and an executive head, the Mayor of
Financial District, Manhattan Hall Park in Lower Manhattan but excludes Battery Park and Battery Park City. The former World Trade Center complex was located in the neighborhood until the September 11, 2001 attacks; the neighborhood includes the successor One World Trade Center. The heart of the Financial District is often considered to be the corner of Wall Street and Broad Street, both of which are contained entirely within the district. The northeastern part of the financial district (along Fulton Street and John Street) was known in the early 20th century as the Insurance District, due to the large number of insurance companies that