Originally an ancient Islamic monument, the Qutub Minar is the tallest tower in India. Built of red sandstone and marble, the minar is not without controversy. Some believe it was built as a tower of victory to signify Muslim rule in the country, while skeptics claim it was erected to call the devoted to prayer. The complex also houses the first mosque to be built in India and an iron pillar that mysteriously has a high resistance to corrosion, even after being exposed to the natural elements for centuries. There are 379 stairs leading to the top of Qutub Minar, but after an accident in 1981, the interior remains closed.