2. Harvard University

At number two is Harvard University, USA.

Established in 1636, it is one of the oldest universities in United States of America.

It has over 21,000 students enrolled in its various undergraduate and post graduate courses. It has a strong academic support of about 2,100 faculty members.

Among its notable alumni include politicians like Franklin Roosevelt, John F. Kennedy, Al Gore, George W Bush and Barack Obama, actors Conan O'Brien, Natalie Portman, Matt Damon and Facebook founder Mark Zuckerberg among others.

Indian economist and Nobel prize winner Amartya Sen was also a student of Harvard.