This article is about the capital city. For the
region of England, see London . For
the historic city and financial district within
London, see City of London . For other uses,
see London. London has a diverse range of peoples and
cultures, and more than 300 languages are
spoken within Greater London.
mLondon metropolitan region at 21 million.
London was the world's most populous city
from around 1831 to 1925.
The London
Underground is the oldest underground railway
network in the world.