London, the capital of England and the United Kingdom, is a 21st-century city with history stretching back to Roman times. At its centre stand the imposing Houses of Parliament, the iconic ‘Big Ben’ clock tower and Westminster Abbey, site of British monarch coronations. Across the Thames River, the London Eye observation wheel provides panoramic views of the South Bank cultural complex, and the entire city.
Greater London covers a total area of 1,583 square kilometres (611 sq mi), an area which had a population of 7,172,036 in 2001.
London has a great range of architecture such as Wren's late 17th-century churches and the financial institutions of the 18th and 19th centuries such as the Royal Exchange and the Bank of England, to the early 20th century Old Bailey and the 1960s Barbican Estate form part of the varied architectural heritage.