Islam proscribes the depiction of living creatures, so most decoration on the stonework consists of inscriptions from the Qu'ran
This iron pillar, over 7 meters high, is one of the foremost metallurgical curiosities in the world. It was originally erected in front of a temple to Vishnu about 402 A.D. (although some sources say as early as 912 B.C.E.)., but moved to this complex around 1233 A.D. It's 97% pure wrought iron and has withstood corrosion for over 1600 years in the open air, quite a testiment to the skill of metallurgists in ancient India.