Scientists both in India and abroad began studying the iron pillar in Delhi in 1912 to try to figure out why it hadn’t corroded. It wasn’t until 2003 that experts at the Indian Institute of ...

Visitors to the courtyard of the complex’s Quwwat-ul-Islam Mosque will immediately spot an imposing 7.2-meter, six-ton iron pillar with a decorative top that’s even older than the complex. Remarkably, ...