By the time of the early dynastic period of Egyptian history, the Great Pyramids have fascinated the Mankind. As long as we know the egyptologists are convinced that they know who built the Great Pyramids. The history shows that these were built at the Fourth Dynasty of Egypt and the same applies to the Sphynx.
Anyway, other people have long been speculated with other origins or some kind of variations over these orthodox theories. We can find all kind of hypotheses from the methods used for their building, historical dating, other civilizations and indeed other species.
The question: Are there any kind of evidences and arguments for any of the theories being true? Is there some kind of proof supporting any ot these theories? Or if you want, what is the correct answer for the question, who built the Pyramids at Giza?