15. Moscow, Russia Urban area: 15.5 million people
City: 11.8 million people
By far Europe's biggest city, Moscow has been swelled by rising numbers of migrants from other parts of Russia and the former Soviet states, attracted by higher living standards. Russia’s expanding economy has attracted people to the capital which is becoming richer.
Urban Detail — With more passengers than New York City and London combined, Moscow has the world’s second busiest metro system after Tokyo. It serves more than nine million people a day, has 182 stations, and 301 kilometers (187 miles) of routes. (Source: Reuters)
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