Stonehenge and Pyramids:How they are build?

I want to start a debate guys, I just wonder how stonehenge was created that way considering there is no machinery on that era that can help build that way? How it was build? Moreover the pyramids too. Some says Aliens interacts with human and they help humans to do it? What's your stand?

i think in earlier days there are many big big peoples which are too long in height and i read in many books that they are tall as one coconut tree i think they work hard they wont get any support from others

i think the early people who have lived in that time are the ones who build those pyramids and made them as their shelters. i think that in order to make those pyramids perfect, they've really given their full effort evil:evil:evil:

There is no alien or magic while they are building the pyramids and Stonehenge . They used a large number of human as their slave and hundreds of elephants to move the rocks to build the Pyramids and Stonehenge. But still we have doubt on how they build such a strong and high buildings when they do not have the technology as we are now .