London is a place.
A capital city ( or simply capital ) is the municipality exercising primary status in a country , state , province , or other region , usually as its seat of government . London [ ˈlʌndən ] is the capital and most populous city of England and the United Kingdom . It is the world 's most-visited city as measured by international arrivals and has the world 's largest city airport system measured by passenger traffic . London was the world 's most populous city from around 1831 to 1925 .