I don't even know for certain how to respond to such an answer, or rather, non-answer. I didn't say I was sure it was aliens. I have no idea. But the Inca, and the people before them, the Aymara, certainly did not believe that the Aymara built Puma Punku and the nearby Tiwanaku. In fact, both people believe that both places were built by the gods in one night. The question we should be asking is not how the Aymara built the place, since they denied building it at all. The question we should be asking is, who the Hell were "the gods" that did build the place? Von Daniken has given us his answer. I am NOT saying that his is the right answer (although I am not certain what his answer is exactly; I have to finish reading the book first). I have no answer at present. But saying the Aymara did it, when they expressly denied doing it, and the natives living in the region (who still speak Aymara and Quechua) STILL deny doing it, and the Inca denied doing it, and everyone who lived there before the Spanish got there, and since then as well, denied doing it and still do, is an incredibly stupid thing to do, and what's worse is a copout. That is the real laziness. We don't know who did it, so lets just say that whoever lived there before there was writing did it. It doesn't matter that they denied doing it, and that the people who followed them and did have writing also denied that they did it (or that they themselves did it). It doesn't matter that both groups have the same story that the gods did it in one night. No, lets assign it to a Stone Age people who possessed none of the wherewithal or tools to do it, and expressly denied doing it! That makes all kinds of sense!
Who were 'the gods'? We don't know, do we? A lot of people in the world have stories of the gods doing this, or that, or the other. Particularly do the gods like to build things. Very large things, that get built that would be difficult or impossible for people nowadays to build, let alone ancient peoples to build. So, the question we should ask ourselves is namely, who are these gods? Von Daniken says they are aliens? Is he right? I don't know. I do not claim that he is. He may be full of shit. He damn sure better have proof if he claims that. So far I have not seen him present any proof that would stand up in a court. But no one else seems to have an answer. So who were the gods? Maybe they were other, more advanced cultures. I used Atlantis as an example. Plato spoke of it. Does that mean it existed? Not necessarily. Does that mean it didn't? Not necessarily.
I'm willing to investigate the question of who the gods were. The reason I am willing is because I find it hard to believe that places like Puma Punku were built by people who couldn't believe themselves that they had built them! If a group of people say, "we didn't do that", who am I to say, "no, you are wrong, you did!". That is a little arrogant, no? So, if they say the gods did it, then I want to know who the gods were. Especially since there are MANY cultures that say that the gods have done many things, including building very large things that would be hard to build otherwise. And I will give someone like Von Daniken a read, just for having the balls to ask the question along with me, even if I disagree with his answer (and I don't know if I do or not).