Located in Delhi, India, the Qutub Minar is constructed with red sandstone and marbel, it is the tallest free-standing stone tower in the world, and the tallest minaret in India, with a height of 72.5 meters (237.8 ft), contains 379 stairs to reach the top, and the diameter of base is 14.3 meters where as the last store is of 2.7 meters. The Construction was commenced by Qutb-ud-din Aibak in 1199 AD and completed by Iltutmish. The Qutub Minar is notable for being one of the earliest and most prominent examples of Indo-Islamic architecture. It is surrounded by several other ancient and medieval structures and ruins, collectively known as Qutub complex. The tomb was commissioned by Humayun’s wife Hamida Banu Begum in 1562 AD, and designed by Mirak Mirza Ghiyath, a Persian architect. It was the first garden-tomb on the Indian subcontinent, and is located in Nizamuddin East, Delhi, India, close to the Dina-panah citadel also known as Purana Qila, that Humayun founded in 1533. It was also the first structure to use red sandstone at such a scale. The tomb was declared a UNESCO World Heritage Site in 1993, and since then has undergone extensive restoration work, which is still underway. Besides the main tomb enclosure of Humayun, several smaller monuments dot the pathway leading up to it, from the main entrance in the West, including one that even pre-dates the main tomb itself, by twenty years; it is the tomb complex of Isa Khan Niyazi, an Afghan noble in Sher Shah Suri’s court …