A french architect named Jean-Pierre Houdin has arguably cracked the method by which the pyramids were constructed back in 2007:
http://www.youtube.com/watch?v=YTgxGJfXRQ0
You'd think, that out of all the disciplines of human knowledge, an architect would have been consulted on the puzzle of the pyramids' construction much earlier, but this is surprisingly not the case. I mean, who better to help decipher how something was built then a person who designs structures?