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Huaca de la Luna stands at the base of Cerro Blanco, a sacred hill near the modern city of Trujillo on Peru's arid northern coast, directly facing its larger companion structure, Huaca del Sol, across an open plaza that once held the residential and administrative core of a major Moche city. Together the two huacas (a term for sacred structures or objects in Andean tradition) formed one of the most important capitals of the Moche civilization, which dominated Peru's north coast from roughly 100 to 800 CE.
Unlike Huaca del Sol, which suffered severe damage when Spanish colonial treasure-hunters diverted the adjacent Moche River to wash away part of the structure in search of gold in the 17th century, Huaca de la Luna survived largely intact, preserving one of the most complete records of Moche religious architecture and monumental painting known anywhere. The structure was not built once but rebuilt and enlarged in at least six successive construction phases across roughly six centuries, with each new phase largely encasing and preserving the previous one rather than demolishing it — a practice that has allowed archaeologists to excavate through the layers and recover wall paintings from earlier phases in exceptional condition, protected for centuries beneath later construction.
The temple's most striking feature is its extensive polychrome mural programme, executed in mineral pigments of red, yellow, white, black, and blue-grey across large plastered wall surfaces. The dominant recurring image is a fanged, staring anthropomorphic being with spider-like or feline attributes, often shown holding a tumi (ceremonial knife) and a severed head — identified by archaeologists as Ai Apaec, sometimes translated as "the Decapitator" or "the Maker," believed to have served as a principal deity in Moche religious and possibly political ideology, closely associated with ritualised violence, sacrifice, and the natural cycles the Moche depended upon for agriculture in their harsh desert environment.
Excavations directed since the 1990s by Peruvian archaeologists Santiago Uceda and Ricardo Morales have uncovered further evidence connecting the temple directly to ritual sacrifice: the remains of dozens of adult male victims, many showing evidence of violent trauma and ritualised treatment of the body, were found in a plaza area associated with the site, providing direct physical corroboration for iconographic scenes of sacrifice and combat that had previously been known only from Moche ceramic and mural depictions — one of archaeology's clearer cases where painted imagery and skeletal evidence converge to confirm the same underlying ritual practice.
Huaca de la Luna remains an active excavation site, with ongoing Peruvian-led research continuing to refine understanding of its construction sequence, ritual function, and the broader urban settlement that once surrounded it.