let's look at what some have artistically created what Puma Punku/Tiwanaku could have possibly looked like when it wasn't broken, buried and scattered.
The truth of the matter is that we don't know what the site looks like. It appears to have been destroyed in some great upheaval in ancient times. Then later the Incas, Spanish and some in much more recent times have scavenged building blocks to use in homes and churches etc.
[On to more about deformed heads ]
The area around Tiwanaku may have been inhabited as early as 1500 BC as a small agricultural village. Most research has studied the Tiwanaku IV and V periods between AD 300 and AD 1000, during which the polity grew significantly in power. During the time period between 300 BC and AD 300, Tiwanaku is thought to have been a moral and cosmological center to which many people made pilgrimages. Researchers believe it achieved this standing prior to expanding its powerful empire. In 1945, Arthur Posnansky estimated that Tiwanaku dated to 15,000 BC, based on his archaeoastronomical techniques. In the 21st century, experts decisively concluded Posnansky's dates were invalid and a "sorry example of misused archaeoastronomical evidence."
- Fagan, Brian M. The Seventy Great Mysteries of the Ancient World: Unlocking the Secrets of Past Civilizations. New York: Thames & Hudson, 2001.
- Posnansky, A. (1945), Tihuanacu, the Cradle of American Man, Vols. I - II (Translated into English by James F. Sheaver), J. J. Augustin, Publ., New York, 1945; Vols. III - IV, La Paz, Bolivia: Minister of Education
- Kelley, D. H., and E. F. Milone (2002) Exploring Ancient Skies: An Encyclopedic Survey of Archaeoastronomy, New York: Springer Science+Business Media, Inc., 616 pp.
That would account for it!