The rainy season is in full swing in the Peruvian Highlands but our visit to Machu Picchu only saw scattered precipitation. Take a look at the rails, the river and the ruins.
granite pluton forces the previously tranquil Urubamba River into a narrow gorge some 2,500 feet deep. The once peaceful river is then turned into a frothy, runoff-swollen maelstrom. Note the high river terrace at the top of the photo - a testament to how fast this river is cutting downward.
here and especially here.
These huge blocks were quarried locally and are composed of marine limestone. They represent deposition before the Andes were uplifted.