The most impressive of numerous Inca ruins peppering the road above Canta, the buildings at Cantamarca – a series of circular dwellings skittering down a mountainside on the right side of the road – date from 1100.
An hour's drive north of Canta, look for the zona arqueologica (archaeological zone) roadside signs; the second sign you'll see (on the left) is the one for Cantamarca.