Ollantaytambo
How did the Inca quarry six rose-rhyolite monoliths weighing tens of tonnes each from a mountainside across the Urubamba River, haul them down, across the valley, and up a second mountain to the Temple of the Sun, fit them with millimeter-tight joints, and then abandon the whole project before it was finished?
mid-to-late 15th century CE (Inca, reign of Pachacuti) · Ollantaytambo, Sacred Valley, Cusco Region, PeruAdded July 2026