This was a quite early city that I settled, it's first task was a monument to grab the marble.
After that, it got a granary and then a library.
A while later I had CoL but not MC so I started a courthouse because it was far away from capital and economy was hurting. At that point I never finished the courthouse though. Then came MC and it got a forge. After that it got the task of building Taj, as it still had some forests standing.
Then came preparation for possible drafting so it got a barracks and a theatre.
Then tactics changed and space might be a viable option so it got to build a university to enable oxford in capital. It also whipped away bad tiles in a observatory.
Can't remember when the harbour was built, but somewhere when I was preparing for waaaaaay later when health could be a problem, as I had too much cash for wealth-building to make sense.
Now, many thousands of years later this city finally got to build a lighthouse, but that was only because I settled a filler city that needed to pig to grow.
Lighthouse here was still worthwhile, and I would have been happy if I got it for free all the way back.