The Iron Pillar from Delhi 7.3 m tall, with one meter below the ground; the diameter is 48 centimeters at the foot, tapering to 29 cm at the top, just below the base of the wonderfully crafted capital; it weighs approximately 6.5 tones, and was manufactured by forged welding.
From the 4th Century, pretty amazing. It's before that pervert, pedophille thug was born.
Yes, this thing is amazing, because it never rusts and you can't damage it with hammers, etc. People try to reach behind their backs to encircle the pillar--if they can, it's supposed to bring them good luck or something.
(My husband and I went sightseeing in Delhi years ago and saw this in person.)