One of the things that kind of annoyed me in GalCiv 2, and is currently still in GalCiv 3, is the indestructible buildings. You know, some of those 1 per planet or 1 per civilization buildings that the game won't allow you to tear down once they are built. That is irritating for many reasons. One reason is that as my tech level increases, and I gain better terraforming abilities, I often want to do some rezoning of my worlds. Like keeping factories grouped up here, research facilities grouped up over there, certain specials in this area, etc. I mean really until you have the best terraforming tech you can get, you just don't have any idea how to plan the layout of your worlds because the landscape can change so much as you progress through the tech trees. And you get many of those indestructible buildings way before you will ever get the best terraforming tech.
Another big reason that it irritates me that there are buildings you can't tear down, is just because conceptually that seems silly. It's like how could we not be able to tear down a building we built ourselves, and rebuild it somewhere else? Is this building somehow immune to any razing equipment or weaponry we have? If so why aren't we building all of our combat ships out of this apparently invulnerable material? Anything that we can make, we should be able to destroy.
So come on devs, let me burn down those buildings! (And rebuild them somewhere else) 
