There is many towers in the world , here the list of the tallest towers in the world for the year 2013.
1-Burj Khalifa in Dubai,UAE is the tallest Tower in the world ,it has height of 2,717 ft and 163 floors , it was built in 2010
2-Makkah Royal Clock Tower Hotel in Mecca,Saudi Arabia.It has height of 1,971 ft and 120 floors , it was built in 2012
3- One World Trade Center in New York,USA. It has height of 1,776 ft and 104 floors , it was built in 2013
4- Taipei 101 in Taipei, Taiwan.It has height of 1,670 ft and 101 floors , it was built in 2004
5-Shanghai World Financial Center in Shanghai , China, It has height of 1,614 ft and 101 floors , it was built in 2008
6-International Commerce Centre in Hong Kong.It has height of 1,588 ft and 118 floors , it was built in 2010
7-Petronas Tower 1 in Kuala Lumpur, 
Malaysia.It has height of 1,483 ftand 88 floors , it was built in 1998
Malaysia.It has height of 1,483 ftand 88 floors , it was built in 1998
8-Zifeng Tower in Nanjing,China. It has height of 1,476 ft and 89 floors , it was built in 2010
9-Willis Tower (Formerly Sears Tower) in Chicago,USA. It has height of 1,450 ft and 108 floors , it was built in 1973.
10-Kingkey 100 in Shenzhen, China. It has height of 1,449 ft and 100 floors , it was built in 2011.
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The 10 Tallest Towers In the World