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London is made up of two ancient cities which are now joined together.
the City of London (or 'the City') the business and financial heart of the United Kingdom. It is also known as the Square Mile (2.59 sq km/1 sq mi). It was the original Roman settlement (Londinium), it is the oldest part of London.
the City of Westminster, where Parliament and most of the government offices are located. Buckingham Palace, the official London residence of the Queen and the Royal family are located there, too.
Together they all make up a region known as Greater London.
London: a city of extremes
London is the biggest city in Britain and in Europe.
London Metropolitan Area has a population of around 15,000,000 (2011)
London has the highest population density; in Britain, with 5,206/km2 (13,466/sq mi) people per square kilometre (13,466 per square mile);
London has the tallest building in Europe: the Shard;
London was the first city in the world to have an underground railway, known as the ‘Tube’;
London has the largest area of underground system;
London has a diverse range of peoples and cultures, and more than 300 languages are spoken within its boundaries;
London's 43 universities form the largest concentration of higher education in Europe.