From top: Chan Chan view, capital of Chimor, Chan Chan walls, Adobe detail at Chan Chan, Panel of warriors detail of wall, Pelican in Chan Chan, Chan Chan model, a wall in Chan Chan
|Location||La Libertad Region, Peru|
|Official name||Chan Chan Archaeological Zone|
|Designated||1986 (10th session)|
|Region||Latin America and the Caribbean|
Chan Chan is located in the mouth of the Moche Valley and was the capital of the historical empire of the Chimor from 900 to 1470, when they were defeated and incorporated into the Inca Empire. Chimor, a conquest state, developed from the Chimú culture which established itself along the Peruvian coast around 900 AD.
Chan Chan is in a particularly arid section of the coastal desert of northern Peru. Due to the lack of rain in this area, the major source of nonsalted water for Chan Chan is in the form of rivers carrying surface runoff from the Andes. This runoff allows for control of land and water through irrigation systems.
The city of Chan Chan spanned 20 km² and had a dense urban center of 6 km² which contained extravagant ciudadelas. Ciudadelas were large architectural masterpieces which housed plazas, storerooms, and burial platforms for the royals. The splendor of these ciudadelas suggests their association with the royal class. Housing for the lower classes of Chan Chan's hierarchical society are known as small, irregular agglutinated rooms (SIARs). Because the lower classes were often artisans whose role in the empire was to produce crafts, many of these SIARs were used as workshops.
The coordinates chosen at right for the location of Chan Chan were determined using "Figure 1: Archaeological Zone of Chan Chan" from Michael West's article, "Community Settlement Patterns at Chan Chan, Peru". In this figure, it can be seen that Verlarde, Laberinto, and Bandelier form the northern border of Chan Chan while Uhle, Chaiguac, Tschudi, and Rivero form its southern flanks. The location chosen for the coordinates is in the center of these cities and so represents a central location for the ruins of Chan Chan amidst this archaeological zone.
The name is probably derived from the Quingnam "Jiang" or "Chang" which means Sun, from which Chan-Chan would be literally: Sun-Sun. It is hypothesized that its true meaning would be: Great sun, resplendent Sun, splendid sun or refulgent sun (since a typical feature of the Quingnam language is that the reduplication of a word acquires a new meaning). Another theory says that the name would derive from the term: Shian or Sian. The "Shi" voice translates as Moon and "An" as a house, meaning House of the Moon, making known that the Moon was the main deity.
After the Inca conquered the Chimú around 1470 AD, Chan Chan fell into decline. the Incas used a system called the "Mitma system of ethnic dispersion" which separated the chimú civilions into places already recently conquered by the Inca. A little over 60 years later in 1535 AD, Francisco Pizarro founded the Spanish city of Trujillo which pushed Chan Chan further into the shadows. While no longer a teeming capital city, Chan Chan was still well known for its great riches and was consequently looted by the Spaniards. An indication of the great Chimú wealth is seen in a sixteenth-century list of items looted from a burial tomb in Chan Chan; a treasure equivalent to 80,000 pesos of gold was recovered (nearly $5,000,000 US dollars in gold).
In 1969, Michael Moseley and Carol J. Mackey began excavations of Chan Chan; today these excavations continue under the Peruvian Instituto Nacional de Cultura.
In 1998, The "Master Plan for Conservation and Management of the Chan Chan Archeological Complex" was drawn up by the Freedom National Culture Institute of Peru with contributions from the World Heritage Foundation – WHR, ICCROM, and GCI. The plan was approved by the Peruvian Government. Methods of conservation include reinforcement and stabilization of structures of main buildings and around the Tschudi Palace, using a blend of traditional and modern engineering techniques. Chan Chan currently has 46 points of critical damage, though the site's total damage far exceeds these points. The regional government of La Libertad is funding conservation efforts at these points.
UNESCO World Heritage Site
On 28 November 1986, UNESCO designated Chan Chan as a World Heritage Site, and placed it on the List of World Heritage in Danger. The World Heritage Committee's initial recommendations included taking the appropriate measures for conservation, restoration, and management; halting any excavation that did not have accompanying conservation measures; and mitigation of plundering. A Pan-American Course on the Conservation and Management of Earthen Architectural and Archaeological Heritage was funded by many institutes coming together, including ICCROM, the Getty Conservation Institute, and the Government of Peru. Archeologists have been trying to protect this city in many ways. They are trying to create rain coverings over the buildings to protect them from the rain and save the adobe buildings that are deteriorating. They have also been trying to create new drainage systems to drain the rainwater faster. Chan Chan has been on the world heritage danger list since 1986. since 2000 they have implemented safety measures that include documentation of everything, public management, and an emergency and disaster plan.
The walled compounds (palaces) that make up the metropolis are the following:
|Old name||Current name||Meaning|
|Chayhuac||Chayhuac An or Quixmic An||Chayhuac House or Beginning House|
|Uhle||Xllangchic An||East House or Sunrise House|
|Laberinto||Fechech An||West House or Sunset House|
|Gran Chimú||Utzh An||Big House|
|Squier||Fochic An||North House|
|Velarde||Ñing An||Sea House|
|Bandelier||Ñain An||Birds House|
|Tschudi||Nik An||Center House|
|Rivero||Chol An||New House or Final House|
|Tello||Tsuts An||Small House|
Walled compound Nik An (Ex Tschudi)
The walled complex "Nik An" is the greatest in illustration of the importance of water, particularly of the sea, and of the cult that surrounded it in the Chimu culture. The high reliefs of the walls represent fish, directed towards the north and the south (what can be interpreted as representation of the two currents that mark the Peruvian coast: that of Humboldt, cold, that comes from the south and the one of El Niño, hot, that comes from the north), waves, rombito (fishing nets), as well as pelicans and anzumitos (mixture of sea lion and otter).
This coastal society was governed by the powerful Chimucapac and was united by the force of a social control originated in the necessity of a strict management of the water, as well as by the external threats. The "Nik An" complex had a single entrance and high walls up to twelve meters for a better defense, and was wider at its bases (five meters) than at its summits (one meter), in anticipation of possible earthquakes on the seismic coast.
Chan Chan has many different types of buildings many of which have been destroyed. Many of the buildings included temples, houses, reservoirs and even funeral platforms. Many of the buildings consisted of ocean like designs such as fish, birds, waves and more. The way the Chimú utilized the space is astonishing. They build the building mostly in a rectangular or square shape through tight spaces. 
The city also consisted of 10 citadels yet only 4 have been recovered. This means the city of Chan Chan had 10 rulers, the Chimú were very adamant on the "Great Lord on top". The culture lived in a classist society where the rulers and gods were on top then it went all the way down to servants. A citadels complex is usually 40 feet tall and built with only one entrance. It was a palace type place with beautiful decorations and was built for a "god or ruler".
Workers and people
Chan Chan held many different types of workers and people. They lived in a classist society where there was a level of important on you, rulers and gods came first and servants can last. The city consisted of nobles, farmers, fishers, trader, servants, and many more. They had many craftsmen in the city who designed beautiful fabrics, pots, and ceramics.
The chimú civilians had a belief that the sun created three eggs, gold for the ruler and the elite, silver was for the wives of the rulers and copper was for anyone else not in those two categories. The elite were the ones who lived in the citadels. the rest of the civilians lived in small home that doubled as their workshops.
Although they were an agriculture city, the Chimú people did excellent jobs on their pottery and textiles and is what they are most famous for. They designed many beautiful pieces of artwork, some of which is still around today.
Religion and culture
The Chimu have 10 citadels, but the Tschudi is the only one that tourists are allowed into. It is believed that Tschudi was built to honor the Chimú God of the sea "Ni". This is believed because of the many ocean-related figures in the building. There was a pond in the middle of the building that was used for religious ceremonies, fertility, and even worshipping water. Something that the Chimu civilians worship very much is the ocean, they are directly next to the Pacific Ocean and get most of their food through it. They also relied very much on their irrigation system, so they believe that worshipping gods related to the ocean is important.
The Chan Chan civilians supposedly spoke the language "Mochica". Once the Inca took over this language was completely wiped out and is currently an extinct language. There's very little documented on the Mochica language. unfortunately, there is no way for us to confirm how this language could have sounded. The Chimú civilian had no writing system where they documented their language.
Not only did they not have a documented writing system for their language, but they also had no written system for writing up blueprints or recording measurements. If you look at a photo of Chan Chan, you will notice how all the buildings are built in a distinct order with space between them. Although there was no documentation it is possible and a theory that they kept records called Khipus much like the Inca. Khipus are detailed records that are systems with knotted cords. Khipus can also be used in situations to communicate information. 
The city has ten walled ciudadelas which housed ceremonial rooms, burial chambers, temples, reservoirs and residences for the Chimú kings. In addition to the ciudadelas, other compounds present in Chan Chan include courts, or audiencias, small, irregular agglutinated rooms (SIARs) and mounds called huacas. Evidence for the significance of these structures is seen in many funerary ceramics recovered from Chan Chan. Many images seemingly depict structures very similar to audiencias which indicates the cultural importance of architecture to the Chimú people of Chan Chan. Additionally, the construction of these massive architectural feats indicates that there was a large labor force available at Chan Chan. This further supports evidence for a hierarchical structure of society in Chan Chan as it was likely that the construction of this architecture was done by the working class.
Chan Chan is triangular, surrounded by 50–60-foot (15–18 m) walls. There are no enclosures opening north because the north-facing walls have the greatest sun exposure, serving to block wind and absorb sunlight where fog is frequent. The tallest walls shelter against south-westerly winds from the coast. The walls are adobe brick covered with a smooth surface into which intricate designs are carved. The two styles of carving design include a realistic representation of subjects such as birds, fish, and small mammals, as well as a more graphic, stylized representation of the same subjects. The carvings at Chan Chan depict crabs, turtles, and nets for catching sea creatures (such as Spondylus. Chan Chan, unlike most coastal ruins in Peru, is very close to the Pacific Ocean.
Originally the city relied on wells that were around 15 meters deep. To increase the farmland surrounding the city, a vast network of canals diverting water from the Moche river were created. Once these canals were in place, the city had the potential to grow substantially. Many canals to the north were destroyed by a catastrophic flood around 1100 CE, which was the key motivation for the Chimú to refocus their economy to one rooted in foreign resources rather than in subsistence farming.Chan Chans irrigations systems were one of the main reasons they ended up being conquered by the Incas. Since the canals could run as long as 20 miles down the mountain of the Moche Vally River into Chan Chan, the Incas ended up cutting off their irrigation system which left them with dying crops from lack of water.
The ancient structures of Chan Chan are threatened by erosion due to changes in weather patterns — heavy rains, flooding, and strong winds. In particular, the city is severely threatened by storms from El Niño, which causes increased precipitation and flooding on the Peruvian coast. Chan Chan is the largest mud city in the world, and its fragile material is cause for concern. The heavy rains of El Niño damages the base of Chan Chan's structures. Increased rain also leads to increased humidity, and as humidity gathers in the bases of these structures, salt contamination and vegetation growth can occur, which further damage the integrity of Chan Chan's foundations. Global warming, if occurs as predicted by some, will only further these negative impacts, as some models suggest climate change facilitates increased precipitation.
Recent archaeological conservation surveys
The archaeological site at Chan Chan is under constant and severe threat of ruin from weathering. Several archaeologists, conservationists, and an array of institutions are working to survey the architecture existing there. Different methods of survey can be utilized but any methodology must be both quick enough to maximize access to extant physical material and accurate enough to document the site effectively. In order to meet these requirements, unmanned aerial vehicles are being utilized. The current state of UAV technology is such that craft consisting of relatively small components combined with lightweight imaging technology can be employed. The possible imaging products include Digital Elevation Models, ortho-photos, and 3 Dimensional Virtual Models. Protective coverings at the site, intended to inhibit the extent of weathering damage to adobe structures, can be a challenge to the use of UAV’s. These methods do not contribute to decay of the physical material. These methods also allow archaeologists to have access to the virtual reproductions into the future and foreseeable technological innovations will most likely add to the potential for analysis of the site.
The Italian Mission in Peru has been working alongside local archaeologists and excavators at the Chan Chan site since 2002.  Roberto Pierdicca of the Universita Politecnica delle Marche conducted imaging missions and compiled a series of results to make conclusions about the scale of the site in 2017. The newest mapwork of the site until this time was created by Harvard University in 1974. Pierdicca’s mission mapped a portion of the site known as the Tschudi Palace.  His work was presented in the eighth volume of Digital Applications in Archaeology and Cultural Heritage in 2018.  The mission employed a Da-Jiang Innovations drone equipped with a SONY Alpha NEX-7 6000 x 3376 pixel resolution camera.  The equipment allowed for both nadir imaging (downward vertical) imaging and oblique (angled) imaging. 1856 images were acquired and 1268 of these were used to create a 15 strip photogrammetric model. In order to construct the three-dimensional model, 105 images taken from ground level with a SONY SLT-A77V camera. Multi View Stereo processing was used to combine the overhead images with those from the ground and form the 3D model. This model was validated by archaeologists and is considered to be compliant with both the Seville Principles and the London Charter.  These models form a baseline for future combinations of overhead imaging with ground surveys at other sites. The archaeological approach is important for the conservation of sites as it allows the data to exist into the future even as looting occurs and weathering takes place.
Between 2016 and 2022, an international project between the Consiglio Nazionale delle Ricerche (CNR) and the Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica (CONCYTEC) was conducted at the site. The work intended to build a 3D Heritage Building Information Model (HBIM) of the Huaca Arco Iris, the largest adobe monumental complex in South America. The huaca is placed chronologically alongside the first structures built at Chan Chan. The time frame of the site’s construction was towards the end of the Middle Horizon in the Central Andes. The primary function of the huaca is believed to have been a ceremonial funerary platform. In 1963, the Patrona de Arqueologia of Trujillo carried out a project to restore much of the walls at the site. This initiative refrained from adding any new artistic designs. This work contributes to the Plan Maestro de conservación y manejo del Complejo Arqueologico Chan Chan, a UNESCO required architectural conservation plan created by the Instituto Nacional de Cultura of Peru. Creating 3D models of the Huaca Arco Iris is one major initiative of the Italian Mission in Peru. The baseline methodology for the work was the data-information-knowledge system.  The data acquisitional survey was initially conducted using spherical photogrammetry. An inspection of the huaca was carried out in 2018 by the Italian Mission. They uncovered additional brick layers on the outside of the south-eastern wall. A SONY Alpha 77 camera was utilized to capture 43 images. With the help of Metashape software, the team created a 3D textured mesh model of the wall. Combined with 3D meshes of the famous bas-reliefs of the other adobe and brick walls, this model was placed into Rhinoceros software to make 3D models of the wall’s architectural components. Colosi et al. reached several conclusions in their work. One conclusion is that consistent monitoring of the huaca and Chan Chan as a whole is necessary for limiting anthropogenic damage. The primary conclusion is that ontology-based Heritage Building Information Models are necessary for the longevity of the physical structures and the collective memory of Chan Chan.
Clay and straw mud architecture is believed to be the oldest building method on earth. It is extremely versatile, especially considering any size bricks can be created and used to build any size structure. 180 UNESCO World Heritage are constructed to some degree from mud. An international conference for the theme of adobe architecture took place in Iran in 1972. In 1994, the Getty Center established a course on mud architecture and its conservation at the Museo de Sitio at Chan Chan.
- Moche Valley
- Chimú Culture
- Inka empire
- Andes mountains
- World Heritage Sites in Danger
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