London area of Square Mile guide
What to do and where to stay in London's Square Mile neighbourhood
While the whole of London cover around 700 square miles, the City of London, the financial district previously occupied by the original old walled city built by the Romans, gets its nickname from the simple fact that it is just over one square mile in area. The Roman city was surrounded by an eighteen foot high wall and a moat and was the beginning of the vast metropolis that we know today as London. The Square Mile is still the world's trading capital with over 500 financial institutions - outdoing both Tokyo and New York. The City has its own police force and annually elected Lord Mayor, who along with the City of London Corporation, administrates everything within the Square Mile and is totally independent of any other national or London authority.