The capacity has been greatly reduced to about 62,000 after the interior was gutted early this century and a new stadium was essentially built within the classic old Greco-Roman walls. It was hugely controversial and the move was lampooned by local architectural critics, but it is now considered a classic of its kind.
Tom McKenna, a former Chicago policeman turned tour guide, said the reduced capacity has added revenue, not taken away.
The more than 100 executive suites generate the sort of income that would only be possible with the equivalent of 193,000 seats, he said.
The highlight of the trip for most was the chance to get a look around the "locker room" the All Blacks will use this weekend. Normally the visitors' changing rooms, the lockers and interspersed with memorabilia, usually jerseys, from famous visiting players and, just to remind everybody whose ground it is, one each of legendary Bears' defenders Dick Butkus and Brian Urlacher.
There is talk that the All Blacks will leave a jersey for posterity at the end of their match.
* Dylan Cleaver travelled to Chicago with All Blacks Tours. Go to www.allblackstours.com to book World Cup packages.