Turn Right at Machu Picchu: Rediscovering the Lost City One Step at a Time

by Mark Adams

the stones are held together without mortar, wedged so tightly that it is impossible to insert a knife blade between them. (It is equally impossible for a visitor to take a guided tour of Cusco during which this fact is not demonstrated.) How the Incas, who possessed no iron tools, no draft animals and no wheeled vehicles, carved and transported these stones is still something of a mystery.

Scientists have calculated that there are thirty-four types of climatic zones on the face of the earth. Peru has twenty of them.