An archaeologist works on part of a newly-discovered entry corridor that leads to a ceremonial courtyard in the pre-Columbian adobe city of Chan Chan, near Trujillo, Peru.

An archaeologist cleans the clay mask on a wooden idol at the entrance to a ceremonial center in the pre-Columbian adobe city of Chan Chan, near Trujillo, Peru.

An archaeologist cleans a wooden idol at the entrance to a ceremonial center in the pre-Columbian adobe city of Chan Chan, near Trujillo, Peru.

Archaeologists clean the clay masks of wooden idols that protect the entrance to a ceremonial center in the pre-Columbian adobe city of Chan Chan, near Trujillo, Peru. Peru's Minis...