They found that the pillar, primarily made of wrought iron, has a high phosphorus content ... upon his migration from Vidisha to Mihirapuri (now Mehrauli), where he founded an observatory ...

In the courtyard of the Quwwat-ul-Islam Mosque, an imposing iron pillar rises tall. At 7.2 metres and weighing six tons, this structure predates even the complex it resides in. Dating back to the ...