Yes you can, but it will never look like it did in the "actual in game footage" we were shown in the hard hitting, amazingly well marketed Carthage trailer. if you're looking for that, you will be disappointed. You can build a port that is about a third of the size of that grand spectacle, and it looks very similar.
Here's screens from a comparison I posted a while back -- after installing GEM, Noif's better textures, mechdonald's FX and a bunch of other mods, I managed to get my game looking like this:
Not bad. Aside from the mind numbingly stupid red floating icons to tell you where things are that you can already see with your own eyes (that you cannot turn off), and the overly massive unit card panel that just refuses to scale properly (and it should never be that big anyway, cards were supposed to scale down as well!) -- aside from that it's not all that bad looking and you can sort of see the harbor you seek too.
Here's what it looks like according to CA:
This is vastly larger in scale and far more grand in every way. Note the entire fleet that can dock and sail in and out of the massive harbor. Note the men garrisoning the buildings. Note the epic size of the hill that rises up from the city that has the temple complex. In game this is more of a small mound that perches above the city and you cannot even access it.