Tiwanaku and Puma Punku: Stone, Ceremony and the Ancient Andes

Long before the Incas, a city on the high plain south of Lake Titicaca drew pilgrims, traders and colonists from across the southern Andes. Tiwanaku, in Bolivia, stands at about 3,850 metres, and at its height, roughly between AD 500 and 1000, it was the ceremonial and political centre of one of the most influential civilisations in South American history. What survives today is fragmentary: platforms, sunken courts, monoliths and the scattered carved blocks of Puma Punku. But read carefully, with the help of a century of archaeology, it tells a clear story about how an Andean society organised land, labour, stone and belief. On Day 16 of our South American Small Group History and Culture Tour, the group travels from La Paz to Tiwanaku and Puma Punku with a local guide.

Tiwanaku, Bolivia, in the ancient Andes

Tiwanaku lies in the basin of Lake Titicaca, near the lake’s southern shore, in a landscape that looks unpromising for a great city: high, cold and open, with short growing seasons and hard frosts. Its success rested on making that land productive. UNESCO counts close to 50,000 raised fields, known in Aymara as suka kollus, built around the basin. These were long planting platforms separated by canals. The water held the day’s warmth through frosty nights, and the algae that grew in the canals fertilised the soil. Bolivian farmers revived the technique in the late twentieth century.

Dates for Tiwanaku vary between sources, and some building at the site is much older, but most archaeologists place its monumental peak between about AD 500 and 1000. Estimates of the city’s population are also contested, ranging from around 10,000 to as many as 40,000. Its influence reached much further. Tiwanaku-style objects and buildings appear in what are now southern Peru, northern Chile, north-western Argentina and other parts of Bolivia. In the Moquegua valley of southern Peru, Tiwanaku colonists farmed alongside an enclave of the contemporary Wari state for around two centuries. Isotope analysis of burials there shows that about a quarter of the people buried had spent part of their lives elsewhere.

Its decline in the eleventh and twelfth centuries is still debated. A long drought was proposed in the 1990s as the cause and has been heavily disputed since, although recent lake-sediment studies do point to dry conditions in the region over this period. Wari declined at about the same time. By the time the Incas reached the Titicaca basin in the fifteenth century, Tiwanaku had long been abandoned, but they absorbed it into their own story, as we will see.

Ceremonial and political space

Early scholars imagined Tiwanaku as an empty ceremonial centre, visited by pilgrims but not lived in. Later excavation showed a real city, with palace compounds and dwellings around its monumental core. Still, the core was designed for ceremony, and walking through it today, you can feel how it was staged.

The largest structure is the Akapana, a stepped platform mound built in several superimposed terraces to a height of more than 16 metres, faced in sandstone and andesite and once crowned by a temple. It is surrounded by drainage canals. Only its lowest level and part of a higher wall survive intact. In the 2000s the Akapana became the focus of a heritage dispute: in 2009 work to rebuild part of it in adobe, although the original was stone, was halted after criticism from archaeologists and intervention by UNESCO.

Beside it lies the Kalasasaya, a large rectangular platform enclosure entered by a flight of steps on its eastern side, its walls built of tall stone pillars with infill between them. UNESCO notes that it is believed to have served as an observatory, and some archaeoastronomers have proposed solar alignments, though these remain interpretations. Inside stands the Ponce Monolith, a carved andesite figure about three metres tall excavated in 1957, holding a kero, a ceremonial drinking vessel. Within the Kalasasaya complex stands the Gateway of the Sun, cut from a single block of andesite. Its frieze shows a central figure holding a staff in each hand, flanked by rows of winged attendants. Researchers believe the gateway has been moved and that its original position is uncertain; one suggestion is that it came from Puma Punku.

Nearby, the Semi-subterranean Temple is a sunken court whose walls, built with 48 red sandstone pillars, are set with carved stone heads. UNESCO suggests they may represent defeated enemies, and their varied styles imply they were added over a long period. Many scholars now interpret this staging of steps, enclosures, sunken courts and monoliths as typical of a pilgrimage centre, where visitors from across the region gathered for ritual and feasting. The keros held by the monoliths point to the ceremonial drinking of fermented beverages, and some research suggests that maize beer, or chicha, imported from lower valleys, played a growing role in Tiwanaku’s political feasts.

Stoneworking and what the material evidence shows

Tiwanaku’s builders used two main stones. Red sandstone, used in the earlier phases, came from quarries to the south, at least 10 kilometres away. The harder grey andesite, used for the finest work in later centuries, came from sources on the far side of Lake Titicaca, near the Copacabana peninsula. Moving stones weighing many tonnes over such distances was a major organisational achievement in itself.

The cutting is remarkably precise. Faces are flat, inner corners are sharp, and some blocks were cut to standard shapes and sizes, almost like modular building parts. Where blocks were joined, builders used I-shaped metal cramps made of a copper, arsenic and nickel alloy. At Puma Punku some of these were poured molten into prepared sockets, while at the Akapana they were hammered cold. No construction tools have been identified at the site. In replication experiments, stone hammers proved capable of shaping andesite, while bronze tools were largely ineffective, which suggests the work was done by skilled labour using stone tools.

Puma Punku without the myths

Puma Punku, a short distance from the main ceremonial core, was a T-shaped raised platform with plazas, ramps and stone gateways. The earliest fill beneath it has been radiocarbon-dated to the sixth century AD, and its fine stonework is probably later. Its blocks are among the most precisely worked in the Americas. The best-known are the andesite “H blocks”, each about a metre across and weighing around 600 kilograms, carved to identical profiles. The largest sandstone slabs are estimated at between 80 and 130 tonnes.

The site looks chaotic because it is. Roughly five centuries of looting and treasure-hunting, the removal of stone for building material and railway ballast, and well-meant but poorly documented twentieth-century restorations have left around 150 blocks, none in its original position. In 2018 the archaeologist Alexei Vranich and colleagues made 3D-printed scale models of 140 andesite pieces and 17 sandstone slabs, using old surveys and field notes, and tested how they might fit together. Their reconstruction suggests a series of nested gateways set one behind another.

Who built Puma Punku?

The people of Tiwanaku did. Puma Punku is sometimes presented online as the work of a lost civilisation or of visitors from elsewhere, but archaeologists reject these claims. Vranich himself calls them pseudoscience. Sunken courts and carved monuments at earlier sites in the Titicaca basin, such as Chiripa and Pukara, show the long local tradition from which Tiwanaku’s architecture grew. The remarkable precision of Puma Punku is evidence of the skill, planning and organised labour of an Andean society, not a mystery that needs an outside explanation.

Tiwanaku, Lake Titicaca and the Incas

Tiwanaku cannot be understood apart from Lake Titicaca. The lake supplied the andesite for its finest buildings, the raised fields that fed it, and much of its sacred geography. When the Incas reached the abandoned city in the mid-fifteenth century, they wove it into their own origin story. They claimed that the creator god Viracocha made the first peoples at Tiwanaku and sent the first Inca to found Cusco, and that Puma Punku was where the world began. The Incas also built shrines on the lake’s islands, linking their dynasty to the place where, they said, the Sun itself had emerged.

The tour follows that geography in reverse. Two days earlier, at the burial towers of Sillustani, the group sees another pre-Inca tradition of the Titicaca basin. The day before Tiwanaku, a hydrofoil crosses the lake to Moon Island and the Island of the Sun, the centre of Inca origin myth. Earlier still, on the Peruvian coast, the pilgrimage centre of Pachacamac offers a revealing parallel: another ancient place of pilgrimage that the Incas later took over and reinterpreted.

How long does a visit to Tiwanaku take, and how much walking is involved?

Allow most of a day from La Paz. Tiwanaku is roughly 70 kilometres from the city, usually about an hour and a half to two hours each way by road, and a visit to the main ceremonial area, Puma Punku and the site museums typically takes two to three hours. The paths are mostly flat gravel, with steps down into the Semi-subterranean Temple; there is no accessible route to the top of the Akapana. There is little shade, so bring a hat, sunscreen and water.

How high is Tiwanaku, and will the altitude be a problem?

The site lies at about 3,850 metres, slightly higher than Lake Titicaca. By the time the group visits, it has spent several days around the lake and in La Paz, which helps. Even so, walk slowly, drink plenty of water, and keep in mind that the sun at this altitude burns quickly even on a cool day. The tour as a whole is rated Level 3, Moderate to Challenging.

Tiwanaku and La Paz

The road from La Paz to Tiwanaku passes the Valle de la Luna, or Moon Valley, on the southern edge of the city, where wind and rain have eroded clay and sandstone hills into a maze of spires and gullies. It is a striking first stop on the day. In La Paz itself, Tiwanaku has long been part of national identity: its great sandstone monolith stood in the city for decades before being returned to the site museum, and each year on 21 June thousands of people gather at Tiwanaku to greet the solstice sunrise for Willkakuti, the Andean New Year, a national holiday in Bolivia since 2010. Our guide to Bolivia has more on the country’s history and culture.

Tiwanaku is the oldest of the great Andean centres on the tour, and it changes how the rest of the journey reads: Inca Cusco and Machu Picchu, seen a week earlier, turn out to be heirs to a much longer tradition. Our overview of the South America cultural tour route shows how these places connect across five countries. On the South American Small Group History and Culture Tour, a Program Leader and local guides bring the archaeology to life for a small group of up to 16 travellers.