Gardens are great (mostly for fountain of youth) but I want to say a nice few words about the Great Harbor, and passive percentage buffs for the economic min-maxer
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Firstly, I'm playing a Merchant Republic (Pisa) and I've put my GH in Messina, which I own - I've put it there because if I put it in Pisa instead I'd be losing it in the election roundabout (as I do NOT want to constantly challenge (I'll explain why)), whereas putting it in Messina I still get the passive buffs, even if I don't get the official ownership. I have also built two barony level cities in Messina - San Marco d'Alunzio & Troina I think they are, both of which I hold in my demesne personally (for those of you who don't use minor baronies, let me teach you the ways of the passive buff). I also have my republic special holding in Messina whenever I am not the doge. Sadly the "A Town Is Born" event has not fired yet, but I still have two features to build on it. When it triggers I will build another city and I will have 5 holdings in one county, all having buffs applied to them.