A ramp with postholes suggests how blocks were hauled -
https://phys.org/news/2018-11-ancient-quarry-ramp-workers-egypt.html
https://www.theguardian.com/world/2018/nov/06/new-discovery-throws-light-on-mystery-of-pyramids-construction
https://www.scientificamerican.com/article/a-ramp-contraption-may-have-been-used-to-build-egypts-great-pyramid/
Nothing about aliens.... :(