Pyramid and megalith conspiracy theories.

I believe that there are so many theories around these buildings are around because of the fact that the are so old and no one would think that humans could build those without the technology that we have today. When the pyramids and megaliths were made, they were made by hand and using hand tools. Now we have machines that can help us do our work without our own physical labor. So i believe that people think that aliens or what not made the pyramids and megaliths is because of the fact that we cannot except the fact of that we were evolved enough to create such magnificent and mysterious buildings.