Quillahuaca
Quillahuaca stands on a high promontory where the Patón and Pampahuay rivers meet in the Andes of Oyón. The site contains stone enclosures, defensive walls and agricultural terraces. Architectural features associated with Inca rule include rectangular halls and trapezoidal openings. Cairns placed over earlier structures point to the continuing ceremonial significance of the hill, whose position commands the valleys and streams far below.