Stock Photo - A wooden barrel and bottles can be seen in the exhibition on beer brewing and hops cultivation in the museum of the Hanseatic city of Gardelegen in Gardelegen, Germany, 21 April 2016. The beer purity law - the 'Reinheitsgebot' - was enacted on 23 April 1516. The beer purity law is considered the world's oldest food law and mandates that only water, hops, and malt may be in the beer. The resident Garley Brewery is considered the world's oldest brand of beer and has not been manufactured since May 2013. Photo: JENS WOLF/ZB | usage worldwide. - Gardelegen/Saxony-Anhalt/Germany