Motivation is not easily stirred within men, but given the right stimulus men have achieved monumental tasks to amazement of others forever. This is a key to why the task must be large to immortalize
those who achieved them.
One such task was given to America in the 60s, to put a man on the moon. The call was answered and the effort achieved a great thing.
Once this type thinking was literally carved from stone, it only take the right motivators to a monumental task , to be answered by the willing to take part in something greater than self.
The most admirable human quality, and reason we excel.
The average Egyptian, and almost all vassal states, could give a shit about Pharaoh's tomb.
Now those that plundered them loved the hell of them. As did those that made money building them.