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Can't add them (why would you want to?) and you can only remove them by either waiting, or, if you want it to go faster, building a Court of Justice and waiting.
EDIT: Or did you mean in the save game? If so, I have no idea.
Have any of you ever thought about making these three bad "improvements" into three new buildings ? It is easy and would add more to the game. Or are there any hidden things I should know?
If I am not mistaken these 3 buildings can only appear through events. So whatever you want to use them for, it won't be things that you will be able to built.