pisac

The shape of the mountain actually looks like a condor (not very obvious with the low resolution of my camera).

The Incas were lovers of tomb making.

The advance water system

All cities were heavily guarded. To enter Pisac, the invaders must deal with the well deafened fortress (or they can fly up the cliff like a condor).

One will always wonder why those people took so much trouble to built cities on top of the mountains (90% of the cities are on rugged terrain). Why not pick a flat valley? Guess defense was a major issues because it was a fitness for survival environment. And since flat land was scared, they usually leave it for farmland so they have enough food for lunch.

The temple of the sun always have a rock inside. People around the world seemed to have a fetish on rocks. The early civilization piled up a rock stack for worship. The Muslims have a sacred rock in Mecca (in the sacred tent). The ten commandments was written on a rock (or stone tablet). The mountain Rushmore... OK, maybe I am a bit off topic.

The patented Inca style wall is always a trapezoid. Just to make it earthquake-proof.