Galactic Wonders and Feats would be cool. It could be a way of getting bonuses withouht sacrificing racial points. Also, the planets that they are built on would become strategically important. Imagine having your galactic capital build the Intergalactic United Nations. you'd get a political bonus, as long as you held on to your Homeworld. Of course in a civil war scenario the Homeworld would be important anyway.
