Archaeologists in Peru have uncovered an extensive Incan burial site inside an adobe pyramid in a coastal desert valley far from the Andean heart of the empire.

Two dozen cave-like tombs with human remains and pottery from the Incan culture have been unearthed so far at the Tucume Archaeological Site, Jose Manuel Escudero, director of the archaeological team working there, said on Thursday.

The finding was a reminder of the vast terrain — from the Pacific coast to the high Andes — that the Incan Empire, using a network of roads and a labor-based tax system, controlled before the Spanish conquest in the 16th century.