Tiwanaku: The Andean Civilization by Lake Titicaca

Tiwanaku was the greatest city of the southern Andes between about AD 500 and 1000, a ceremonial and political capital built near the southern shore of Lake Titicaca in what is now Bolivia. Its stone platforms, carved monoliths and the famous Gateway of the Sun made it a sacred place long after its fall. Tiwanaku’s influence reached from the Peruvian coast to northern Chile, and its farmers turned a cold, high plateau into productive land.

Setting on the high plateau

Tiwanaku stands on the Altiplano, a high plain at around 3,850 m above sea level, where frosts, thin air and short growing seasons make farming difficult. The site lies about 15 km from Lake Titicaca, the largest lake in South America by volume, which moderated the local climate and provided fish, reeds and waterfowl.

Herding of llamas and alpacas supplied meat, wool and transport. Potatoes, quinoa and other hardy crops grew on the plain, and freeze-drying produced chuño, a potato that could be stored for years. This mix of herding, farming and lake resources supported the growth of a large population.

From village to ceremonial city

People lived in the Tiwanaku Valley from at least the late first millennium BC, and the region already had ceremonial centres such as Chiripa and Pukara. Tiwanaku grew gradually, and by the middle of the first millennium AD it had become the leading centre of the southern Titicaca basin.

Archaeologists divide its history into phases, with the city’s height usually placed between about AD 500 and 1000. Its original name is unknown; “Tiwanaku” (also spelled Tiahuanaco) is the name recorded in colonial times.

Monuments of Tiwanaku

The core of the city was a sacred precinct surrounded by a moat. Its largest monument, the Akapana, is a terraced platform mound about 16–18 m high, built of earth faced with stone, with an elaborate system of drains. Next to it lies the Kalasasaya, a large rectangular enclosure on a raised platform, entered by a monumental stairway.

Within the Kalasasaya stands the Ponce Monolith, a carved standing figure holding ritual objects. Nearby is the Semi-Subterranean Temple, a sunken courtyard whose walls are studded with carved stone heads. The largest known statue, the Bennett Monolith (also called the Pachamama Stela), is about 7 m tall; it was taken to La Paz in 1932 and returned to a museum at the site in 2002.

About 1 km away lies Pumapunku, a platform complex famous for its precisely cut andesite and sandstone blocks, including H-shaped stones with identical profiles. Builders used notches and metal clamps, poured or set in T-shaped sockets, to bind blocks together. Much of Pumapunku was later pulled apart and the stones scattered.

The Gateway of the Sun

The Gateway of the Sun is Tiwanaku’s best-known monument. It is a doorway cut from a single block of andesite, about 3 m high and 4 m wide, now standing in the north-west corner of the Kalasasaya. Archaeologists think it was probably moved there and may originally have stood elsewhere, perhaps at Pumapunku.

Its lintel carries a frieze centred on a frontal figure holding two staffs, often called the Staff God or Gateway God. Around it run rows of smaller winged figures in profile, some with bird heads, running towards the centre. Similar imagery appears on Wari pottery and textiles from Peru, showing that the two states shared a religious tradition. The gateway is cracked through, and the date and cause of the break are unknown.

Raised fields and the economy

Tiwanaku’s farmers built extensive raised fields, called suka kollus in Aymara, on the swampy plains near the lake. These were long planting platforms separated by water-filled canals. The water absorbed heat by day and released it at night, protecting crops from frost, while algae and silt in the canals provided fertiliser.

In the 1980s archaeologist Alan Kolata and Bolivian colleagues worked with local farmers to rebuild experimental raised fields near the site of Lukurmata. Early harvests were much larger than on ordinary fields, though later results were mixed and the scale and productivity of the ancient system remain debated.

Llama caravans linked Tiwanaku with distant regions. Settlements with Tiwanaku pottery and architecture appeared in the Moquegua valley of southern Peru, where colonists grew maize, and Tiwanaku goods reached the oases of San Pedro de Atacama in Chile. Whether this network was an empire, a set of colonies or a religious sphere of influence is still argued over.

Decline and collapse

Between about 1000 and 1150 Tiwanaku lost its power. Large building projects stopped, the city’s population dispersed, and the provincial colonies were abandoned. Some monuments appear to have been deliberately damaged.

Ice cores from the Quelccaya glacier in Peru and sediments from Lake Titicaca indicate a prolonged dry period beginning in the 11th century. Many scholars think falling lake levels and drought undermined the raised-field system on which the city depended. Others stress internal political conflict and the weakening of the elite, and most now see drought and social stress acting together.

After the collapse, the Titicaca basin was divided among smaller Aymara-speaking kingdoms, such as the Colla and Lupaqa. These were conquered by the Inca in the 15th century.

Rediscovery and legacy

The Inca revered Tiwanaku and linked it to the creator god Viracocha, who in some myths made the sun and the first people at Lake Titicaca. Spanish chroniclers, including Pedro Cieza de León around 1549, described the ruins with wonder. In later centuries stones were taken for churches, houses and a railway line.

Scientific study began with explorers such as Ephraim George Squier in the 1860s and 1870s and excavations by the American archaeologist Wendell C. Bennett in 1932. Bolivian archaeologist Carlos Ponce Sanginés led major work from the 1950s. UNESCO listed Tiwanaku as a World Heritage Site in 2000.

Tiwanaku remains a powerful symbol of Indigenous heritage in Bolivia. It is the setting for Aymara New Year celebrations at the June solstice, and Bolivian presidents have held inaugural ceremonies there. It is often compared with the Wari Empire, its contemporary to the north, and with earlier Andean centres such as Chavín de Huántar.

Myths and facts

Pumapunku is a favourite subject of “ancient aliens” claims that its precise blocks could not have been cut by humans. Archaeologists have shown that stone tools, abrasives and careful planning explain the work, and unfinished stones at the site show the stages of shaping.

Another popular claim holds that Tiwanaku is 10,000 years old or older. Radiocarbon dates from excavations place the city’s construction in the first millennium AD, consistent with its pottery and its links to Wari.

Timeline

• c. 500 BC – AD 300: Early villages and ceremonial centres develop in the southern Titicaca basin.
• c. AD 500: Tiwanaku grows into a major urban and ceremonial centre.
• c. 600–900: Major construction at the Akapana, Kalasasaya and Pumapunku; colonies founded in Moquegua.
• c. 1000–1150: Drought and political breakdown; the city is largely abandoned.
• c. 1549: Pedro Cieza de León describes the ruins.
• 1932: Wendell C. Bennett excavates and the Bennett Monolith is moved to La Paz.
• 2000: Tiwanaku is inscribed on the UNESCO World Heritage List.
• 2002: The Bennett Monolith is returned to the site.

Why it matters

Tiwanaku shows how an Andean society created a great city in one of the harshest farming environments on Earth. Its monuments, religious imagery and farming methods influenced later Andean peoples, including the Inca, and its fall is a key case study of how climate change and politics can bring down a state.