Wow! Looks fascinating and well worth a visit. Let's hope they don't improve access to the site, so that it won't become overrun with tourists as has happened at MP.
Another archeological site worth visiting is in the north: the mountaintop fortress of Kuelap, near Chachapoyas. The site itself is accessible by (unpaved, and dangerous) road and, since a few years ago, by cable car. However, because there is no commercial air service to Chachapoyas, getting there from Lima is a chore, so it's not yet nearly as popular as MP. Highly recommended.