The statistics are from Euromonitor. In Millions of Over Night Stays by Foreign Tourists:
1 London, UK 15.64
2 Bangkok, Thailand 10.35
3 Paris, France 9.70
4 Singapore, Singapore 9.50
5 Hong Kong, China 8.14
6 New York City, USA 6.22
7 Dubai, UAE 6.12
8 Rome, Italy 6.03
9 Seoul, South Korea 4.92
10 Barcelona, Spain 4.69
11 Dublin, Ireland 4.47
12 Bahrain, Bahrain 4.42
13 Shanghai, China 4.31
14 Toronto, Canada 4.16
15 Kuala Lumpur, Malaysia 4.12