The pyramids are still a huge mystery to people and they will remain that way because their creation was entirely alien and not human. We built them to hide certain things deep underground and the pyramids are simply hollow reference points that we keep. We did place artifacts inside them to make it seem like they had another purpose, but the truth is that their real purpose is just to be there.
We are amused by how much speculation has been build regarding how they came to be, but some of the sci-fi that humans have been coming up with is actually a bit accurate out of pure coincidence. The pyramids will remain as part of some of the alien architecture that we have placed on this planet. There are many other alien constructions on Earth, but we want humans to continue thinking they are man made in order to avoid suspicion.