By Mukesh 
Which is the tallest building in the world? You will answer without hesitation that it is the Burj Khalifa in Dubai, U.A.E. What if I were to ask you which building held that spot before the Burj Khalifa? The fact-seekers and quiz-heads might be able to answer that one (Psst… It is Taipei 101 in Taipei, Taiwan). But what if I were to ask you the one before that? And before that? Even trivia-hunters might not be able to give that easily.
While it might not be easy to recollect each of these buildings, progression in records give a sense of how far things have come. In the case of tallest buildings, it can in fact go back thousands of years to the Great Pyramid in Egypt. Sears Tower is the answer to that fourth and final question (Petronas Towers in Kuala Lumpur, Malaysia, is the answer to the other question) and the building that we will be looking closer at.