1. Great Wall of China Constructed (18h 40min, jan 2, 220 y BC – 6h 44min, dec 25, 220 y BC)
Description:
It was constructed around 220 BC in order to unify pre-existing walls.
Added to timeline:
Date:
18h 40min, jan 2, 220 y BC
6h 44min, dec 25, 220 y BC
~ 11 months