The Calchaquí Valleys stretch across the provinces of Salta, Tucumán and Catamarca in northwest Argentina. They're known for their rugged landscapes, striking red rock formations and high-altitude vineyards. Southwest of the colonial city of Salta, Route 33 runs through the Escoipe Ravine. It takes a winding route, known as Cuesta del Obispo (Bishop’s Slope), up to a mountain pass with far-reaching views.