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A cutaway of the WTC1 & WTC2 structure (from http://www.tms.org/pubs/journals/jom/0112/eagar/eagar-0112.html by Thomas W. Eagar & Christopher Musso, JOM, Vo. 53, No. 12, 2001)

Multiple trusses, supporting each floor of each WTC building and shown in the next two slides, spanned the short distance between the outer (perimeter) wall and the strong inner core (shown here in orange) and also spanned the long distance between opposite perimeter walls in the regions between the core and the outer walls.

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