Thought by many to have been built entirely by the Incas -- some of the work is really much older --
and no one really knows who originally placed the different looking stones -- or when --
although, yes, it appears the Incas did build upon the foundation rocks but at a later date.
But one can easily discern the difference in building expertise.
High in the Andes, Machu Picchu is a sight to behold.
But, rather than expending all that energy to actually view it in person
and it does take a lot of energy --
today's DIT will give you a vicarious experience of its beauty
and you will not need an oxygen tank or trekking poles --
HERE'S THE LINK to Machu Picchu
