What are the legends about qutb minar?
There is a legend that the Qutub-Minar was built by Prithviraj, the last Chauhan king of Delhi, for enabling his daughter to behold the sacred river Yamuna, from its top as part of her daily worship.
Other facts about this landmark can be found at http://www.onlytravelguide.com/delhi/historical/qutub-minar.php