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.
Just out of the aerial picture to the bottom left is the site of the Puma Punku. This is another 'temple area' with many finely cut stones some weighing over 100 tonnes. Its position to the south of the Akapana may have been important because it gave a good view to a sacred mountain far to the east.