Beer brewery. Worker operating a foot pedal while holding open a hatch on a vat at a beer brewing facility. Beer is brewed by the fermentation of cereal grains, usually barley, using yeast. The barley goes through several stages in a brewery before the final beer product is formed. Photographed at the Shepherd Neame brewery in Faversham, Kent, UK, which was founded in 1698 and claims to be Britain's oldest brewery.