Inkan structures at Pisac The description from the exhibit: The strategic placement of this cluster of Inka buildings at Pisac commands a stunning view. By building sites in lofty, highly visible locations, the Inka established their dominance over a region and its population. Sites like Pisac, Ollantaytambo, and Machu Picchu also served as checkpoints to oversee the delivery of goods and products to the city of Cusco. This is part of The Great Inka Road: Engineering an Empire exhibit at the Smithsonian National Museum of the American Indian (NMAI) in Washington, DC. Ideum worked with NMAI for over a year and a half, helping to develop a multiuser interactive exhibit which runs on an 84″ multitouch table. Visitors can interact with a 3D reconstruction of the ancient city of Cusco, which was the heart of the Inkan civilization that ruled over much of the South American Andes in the 15th and 16th centuries.