11.9538°S, 77.1184°W.
El Paraiso is a Late Preceramic complex in the lower Chillon Valley north of Lima, dated approximately 2000 to 1800 BCE. The site spans roughly 58 hectares and contains at least nine stone platform mounds, the largest measuring 250 by 50 metres and rising 8 metres above the valley floor. Construction used quarried angular stones set in clay mortar and faced with plastered mud — over 100,000 tonnes of stone moved without metal tools or beasts of burden. Excavations by Frederic Engel in 1965, by Jeffrey Quilter in the 1980s, and by Rafael Vega-Centeno after 2012 identified small ceremonial chambers with central hearths matching the Kotosh Religious Tradition. El Paraiso is one of the largest preceramic sites in the Americas and was occupied before the introduction of pottery to the Andean coast.
Unit I, the principal mound, was partially reconstructed in 1965 and stands today as a long pale rectangle visible from the Pan-American Highway.