3. Acueductos Nasca, región Ica.
I think I have been there while waiting for my bus to Arequipa. I would assume this is a simple extension of Nasca, not a new site.
I wouldn't think so. The lines are artistic marvels whereas the aqueducts are for water management. You have seen it yourself :) I got to see the the Cantayoq aqueduct on my overflight plus it's easy to visit by taxi. We don't have any map data by the way, i can see these are mentioned as well:
Ocongalla, part of a tour if you go to the Cahuachi Pyramids