The Q’eswachaka bridge spans the Apurimac river near Huinchiri in Canas Province, Peru. Since the time of the Inca, the residents of the region gather annually to rebuild this bridge using traditional Inca engineering techniques. In only three days, the bridge is constructed out of grass (known as Q’oya) which has been woven and pulled into cables by the communities. Once a new bridge has been completed, the old bridge is cut down and allowed to fall into the river below. See below for a video of this amazing example of traditional bridge building.