The oldest , still functional , brewery in the world is believed to be the German state-owned Weihenstephan brewery in the city of Freising , Bavaria . It can trace its history back to 1040 AD .
The oldest brewery in the world still in operation is believed to be the Bavarian State-owned brewery Weihenstephan , found in the German city of Freising , which can trace its history back to 1040 .