Archaeological complex of Ollantaytambo, Peru. It is a National Archaeological Park of Inca architecture. It is located about 90 km northwest of Cusco. Altitude of 2,800m. It is one of the most monumental Inca works. I strongly recommend the visit. Obviously don't go now. Wait for the political confusion to calm down and make sure there is no longer any risk of paramilitaries blocking the roads. Note that protesters treat tourist spots as a preferred target for blockade and that the Peruvian government does little or nothing to help tourists.