Qutub Minar Delhi
Qutub Minar symbolizes Delhi as Hawa Mahal represents Jaipur. One of the most mind-boggling structures in the Qutub Minar Complex is the seven-metre-high iron pillar raised in memory of Chandragupta-II, who ruled from 375- 413 AD. The iron in this pillar is exceptionally pure- scientists remain in the dark about how the iron, which has not rusted in 1600 years, could have been cast using the technology of the time.
The Qutub Minar (the leaning tower of Delhi) itself is a soaring victory tower that stands almost 73 metres high, tapering from a 15-metre-diametre base to just 2.5 metres at the top. There are a total of five storeys- Qutub-ud-din, the sultan who initiated the project, was eager to see the tower rise before his eyes, but sadly only lived until the completion of the first storey. It was finished by his successors, then in 1368 Firoz Shah replaced the top storey with two more and added a cupola, which crashed down in an earthquake in 1803. The tower now leans about 60 centimetres off the vertical, but it has otherwise worn the centuries remarkably well.