Puka Pukara Archaeological Complex

This guide to Puka Pukara, on a high ridge above Cusco, starts with its Quechua name, red fortress, and the trick of light that turns its gray volcanic walls the color of embers only at sunset. It follows the soldiers once posted at this checkpoint on the road north out of the city, watching both for enemies and for the punishing swing from midday warmth to near-freezing after dark, and traces the stone water channels linking this outpost to the bathing shrine at Tambomachay less than a kilometer away. Stand at the walls near dusk to catch the same light travelers once watched centuries ago.