Indra Pillar

In Delhi, in the courtyard of the Qutb Minar mosque, there is a metal column known to the world as the "Indra Pillar.

For several thousand years it has withstood the effects of the weather without a trace of rust. The column is made of atomic iron without carbon and sulfur impurities at the molecular level. Nowadays it is possible to obtain such perfectly pure iron by sputtering only in a vacuum and only in small quantities. The height of Indra's Pillar corresponds to a three-storey house; moreover, the Pillar goes into the Earth for several tens of meters.

It is not clear how, with the help of what mechanisms this miracle was made and installed.