The iron pillar of Delhi is a structure 23 feet 8 inches high with 16 inches diameter that was constructed by Chandragupta II, and now stands in the Qutb complex at Mehrauli in Delhi, India. It is famous for the rust-resistant composition of the metals used in its construction. The pillar weighs over three tonnes and is thought to have been erected elsewhere, perhaps outside the Udayagiri Caves, and moved to its present location by Anangpal Tomar in 11th century.