[SunkenCiv]

from a different article, different culture, authored by Charles C. Mann.

Treasure. An ancient Peruvian mask made out of gold. [Credit: iStockphoto]

[Fred Nerks]

source

Peru. Chan Chan. The vast crumbling ruins of the imperial city of the Chimu (they taught the Inca most of what they knew about irrigation). Chan Chan is the largest adobe city in the world and covers over 28 square kilometers.