Qutab Minar, one of the tallest brick minarets in the world, is an incredible example of early Indo–Islamic architecture. It was built in 1193, but the reason remains a mystery.
Purana Qila is one of the oldest forts in Delhi, India. Reconstructed by the second Mughal Emperor Humayun and Surid Sultan Sher Shah Suri, it is thought by many to be located on the site of the ancient city of Indraprastha.