The Moscow city limits are already comparable. Paris's city limits are 105.4 km2, while London's are 1,572 km2. The Moscow city limits are almost twice the size of London's city limits and twenty-five times larger than Paris's.
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Moscow has 64 billionaires and London boasts 54. Moscow, Mumbai and Istanbul are significantly higher on the billionaire list than they are on the millionaire rankings.
Tokyo is the largest with 37.4 million inhabitants; to get into the top 100 list, a city would need to match the population of Ürümqi in China with 4.4 million. To make the top ten, a city would need 19.2 million. In 1800, London topped the largest 100 list with 1.1 million inhabitants.
The Sumerian city of Uruk (modern-day Iraq), allegedly home to the legendary king Gilgamesh, topped the list with 40,000 people. It was followed by Memphis (Egypt) with 20,000 inhabitants.
To enter Russia for any purpose, a U.S. citizen must possess a valid U.S. passport and a bona fide visa issued by a Russian Embassy or Consulate. It is impossible to obtain an entry visa upon arrival, so travelers must apply for their visas well in advance.