London
  London is the capital city of England.
  It is the most populous city in the United Kingdom,
  with a metropolitan area of over 13 million inhabitants.
 
  Paris
  Paris is the capital of France.
 
  The Paris area is one of the largest population centers in Europe,
  with more than 12 million inhabitants.
 
  Tokyo
  Tokyo is the capital of Japan.
  It is the center of the Greater Tokyo Area,
  and the most populous metropolitan area in the world.