Puma Punku, truly startles the imagination. It seems to be the remains of a great wharf (for Lake Titicaca long ago lapped upon the shores of Tiahuanaco) and a massive, four-part, now collapsed building. One of the construction blocks from which the pier was fashioned weighs an estimated 440 tons (equal to nearly 600 full-size cars) and several other blocks laying about are between 100 and 150 tons. The quarry for these giant blocks was on the western shore of Titicaca, some ten miles away. There is no known technology in all the ancient world that could have transported stones of such massive weight and size. The Andean people of 500 AD, with their simple reed boats, could certainly not have moved them. Even today, with all the modern advances in engineering and mathematics, we could not fashion such a structure.
Puma Punku ruins, Tiahuanaco, Bolivia
Source: Jean-Pierre Protzen & Stella E.Nair, “On Reconstructing Tiwanaku Architecture”, Jpurnal of the Society of Architectural Historians, Vol. 59, Nr.3, 2000, pp. 358-371
pssst...'they' didn't have to carry it anywhere...IT'S CONCRETE!