Here is where I plan to be this weekend, in Huinchiri, to witness the annual rebuilding of the Keshwa Chaca, or Inca straw bridge over the Apurimac River. Notice how Huinchiri is a dot with no roads anywhere near it!
Here are some articles about the bridge:
http://www.csmonitor.com/2007/0725/p20s01-litr.html?page=1
http://www.rutahsa.com/k-chaca.html