Imagine we wanted to make an exact copy of the pyramids in Egypt, the great pyramid specifically.
Never mind building them without machines. Do you think mankind, not just the current residents of Egypt, but do you think in this world there exists the technical know how and political will to even be able to do it?
No. There is not the will for that kind of labor anymore. Look at modern architecture compared to even a few hundred years ago. Despite the advancements in technology, modern buildings are just concrete blocks now. Buildings used to take years or even decades to build, now they are done in months.