Aliens and Pyramids: Forbidden Knowledge

Pyramids can be found in the Middle East, Latin America, Asia, Europe and The North American Continent. How were they constructed, and what was their purpose? If man built the pyramids on his own, then we would expect there would be an enormous effort to record such an achievement. However, no culture that had pyramids has any clue how they were built. Apparently, they did not have the means, knowledge, or technology to do so. The theory that aliens from another world may have assisted in buildi...