Well, there were the Egyptian Pyramids, Great Wall of China, Roman Aqueducts and a whole bunch of Great Projects in the past and I certainly hope there will be lots more in our future.
Those projects took centuries to complete.
As far as I know, the pyramids were each constructed for a single pharaoh, and during their single lifetime. I don't know about all of them, but that's at least true of Great Pyramid of Giza.
Or just a few turns, depending on your difficulty setting. (-;
We don't know how some of the Egyptian pyramids were constructed, or when, or how long it took.
If the Starship program succeeds in reaching the moon in the next few years then I think that is comparable to Apollo. Ofc it is easier to do things the second time than the first but safety standards are higher and this time it will have been done at an enormously reduced price.