Photo of Machu Picchu from the
year 1965 before becoming the most popular tourist destination in South America.
This image of the Machu Picchu Inca ruins shows the Sun Temple (curved building
on the left) and various agricultural terraces on which crops were cultivated.
Note that at this time they were using inclining timbers to help hold up
various walls that were weak and in danger of collapsing. Since this time,
these walls have either been reinforced or in some case rebuilt in order to make
them more secure and less likely to collapse in case of an earthquake or tremor.
Although there are numerous agricultural terraces in Machu Picchu which are
irrigated by natural springs present on the site, it is thought that these
cultivated lands were not sufficient to provide food for all the people living
there. Note the relatively small sun temple whose walls are curved in
contrast to the planar walls in other structures.