The palace, the protests and the red carpet: How OPEC’s seminar played out

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For centuries, Vienna's romantic Hofburg palace served as a winter residence of the imperial Habsburg dynasty — this week, though, it welcomed Saudi royalty, energy ministers, top CEOs and a slew of analysts traders and more.

Since 1965, Vienna has housed the headquarters of the OPEC Secretariat — the administrative backbone of the 12-member OPEC alliance of oil producers.