The industrial revolution caused migrations to urban areas on large scale. Industrial jobs, Mechanizations, international trade all these factors combine played the role to promote urbanization. To get facilities including the better living standard allowed the millions of people to move towards cities. Now almost half of the world lives in cities. The role of world cities is more for multinational corporate organization, Banking, finance and international agencies. Some large and influential cities of the world are New York, London, Tokyo, Washington DC, Los Angeles Paris and Singapore etc.