6. Hong Kong
Hong Kong is the city that seems to get all of the attention each year by gathering an average of 11.1 million visitors annually.
Millions of people that have wanted to tour such sites as the Hagia Sophia mosque and other widely known attractions throughout Istanbul have greatly contributed to this city increasing his overall number of visitors by 15% in recent years and allowing it to have the highest growth rate of visitor spending in the world (close to 21%).
11.8 million is the average number of tourists that visit Singapore each year either for business or pleasure purposes and this number has been able to stay pretty consistent for several years now.