Ollantaytambo is a village in the Sacred Valley of south Peru, set on the Urubamba River amid snow-capped mountains. It's known for the Ollantaytambo ruins, a massive Inca fortress with large stone terraces on a hillside. Major sites within the complex include the huge Sun Temple and the Princess Baths fountain. The village's old town is an Inca-era grid of cobblestoned streets and adobe buildings.