Inca site in Urubamba Valley, near Cuzco, Peru. It was a planned, trapezoidal town with ceremonial and domestic architecture. It was a royal estate for Inca Pachacuti and then used as a fort when the Spanish arrived. Architecturally, the Incas surpassed all others in their use of intricately cut, giant-size stone blocks, as displayed at Ollantaytambo.