Cusco and Machu Picchu in 3 days: acclimatize with coca tea at 3,399m, the Qorikancha (the "Golden Enclosure" — the most sacred Inca building: walls once covered in 700 sheets of gold, stripped by the Spanish in 1532 to build the Santo Domingo convent on top), the San Blas quarter (the most elaborately carved wooden pulpit in South America), Sacsayhuaman (the most impressive Inca stonework in the world: polygonal blocks up to 360 tonnes fitted without mortar), the Sacred Valley (Pisac terrace system — 1,500m of continuous terracing, Ollantaytambo — the only Inca-era urban grid still inhabited, the unfinished Temple of the Sun with 50-tonne monoliths), overnight in Aguas Calientes, Machu Picchu at sunrise (UNESCO, 1450 CE — built by Pachacuti), Huayna Picchu or Machu Picchu Mountain hike, and farewell lomo saltado in the most historically layered city in the Americas.