7.6490°S, 77.4180°W.
Gran Pajaten is a Chachapoya ceremonial complex hidden on a forested ridge above the Montecristo River in the Rio Abiseo National Park of San Martin, northern Peru. Occupation is dated to roughly 200 to 1500 CE, with the visible architecture belonging to the Late Intermediate Period. The complex consists of at least 26 circular stone buildings arranged on terraces, the largest about 15 metres in diameter. The structures are built of stacked schist slabs bonded with clay and decorated with mosaic friezes of geometric step patterns and human figures with outstretched arms inserted directly into the wall fabric. The site was reported to outsiders in 1963 by farmers from Pataz and first surveyed archaeologically by Duccio Bonavia in 1965. Access requires a multi-day trek through cloud forest, and the park boundaries restrict visitation to protect both the ruins and the spectacled bear habitat surrounding them.
The figurative wall mosaics remain the most distinctive Chachapoya architectural ornament known.