Wonders

Wonders are buildings unique across all civilizations that must be constructed on their own lots in territory you own. If you do not have any open lots, you may not construct any wonders. All wonders should conform to current construction capabilities of your civilization. For example, no electric lights in the Ancient Era, or metal objects before Iron Working has been researched. If a lot type requires objects you can't yet buy, creating an un-routeable basement and stashing them there is allowed.