As you imagine what the Twin Towers would look like if they were to go global I want to call to your attention that there are World Trade Centers in approximately 100 countries. You may want to look at many of these buildings (http://www.wtca.org). They are under the umbrella of the World Trade Centers Association. I formerly worked for the WTCA and recently retired.
Submitted for Twin Towers Go Global by Pedro Lasch & collaborators