The Inca supply canal flowed gently into Machu Picchu at an… | 
The water supply canal ends in a series of 16 semiprivate fountains. | 
Machu Picchu is unique geography presented Inca engineers with a… |
Machu Picchu was in good condition after four centuries of rain… | 
Hiram Bingham's 1912 photo of Machu Picchu agricultural terraces… | 
Long-term 10-year running average of precipitation based on Quelccaya… |
Machu Picchu and Environs, showing two main geologic faults… | 
Map of Inca Empire at time of arrival of conquistador Pizzaro in… | 
Test pit in plaza area showing soil profile, sand lenses, early wall… |
