The rooftop of Vienna's OPEC headquarters during an OPEC meeting.
The rooftop of Vienna's OPEC headquarters is seen behind traffic lights during a meeting of OPEC oil ministers January 30, 2005. OPEC oil ministers agreed to leave their production ceiling unchanged at 27 million barrels per day, Qatari Oil Minister Abdullah al-Attiyah said. REUTERS/Heinz-Peter Bader HPB/acm