Qutub Minar in Delhi is world heritage site. The tall minaret was constructed in 1192 by Qutab-ud-din Aibak, and later completed by his successor Iltutmish. The soaring conical tower is an exquisite example of Indo-Islamic Afghan architecture.
There are evidence that Qutubminar was built much before by Hindu emperors. Later Kuttubuddin has replaced the writing on stones.
Qutub Minar is a World Heritage Site and has survived the ravages of time impressively. The Minar of Delhi is surrounded by a lush green garden, which is an ideal leisurely place for visitors. Qutab Minar is the favourite destination of tourists. 
The tower is so high that around 379 steps are needed to be climbed to reach the top. Another taller tower adjacent to Qutub Minar is named Alai Minar which is somewhat tilted in one direction.
The verses from the holy Qur'an are carved on sandstone walls of Qutub Minar. This monument serves the purpose of calling people for prayer in the Quwwat-ul-Islam mosque.
Qutub Minar was built by Qutubuddin-Aibek. But, it was completed by Iltutmish.
It is the tallest monument in India. Due to Natural disasters  it decreased its height. It is located in Delhi/