The Iron Pillar Of Delhi

The Iron Pillar of Delhi is not very eye-catching at first glance. It is a middling 23 feet tall and is part of the Qutub Complex, which also contains the considerably more remarkable Qutub Minar. In fact, it might not even be Delhi's most attractive iron pillar.

However, one of the biggest mysteries in chemistry has persisted for a very long time. Based on its inscriptions, the pillar was most likely constructed between the fourth and fifth century AD, but despite this, it has managed to avoid rusting. Though with limited success, many studies have attempted to identify the precise chemical make-up of the pillar that enables it to do that.