Brewing activities in Leuven date back to 1366 (then Brewery Den Hoorn, later Artois Brewery after its head brewer). Today 9 mio hl / year can be brewed at the world's largest brewer's HQ site.
This is the biggest brewery in Belgium. You will see it when you're entering Leuven/Louvain by car. Here Stella Artois is brewed. Stella is one of Belgians most favourite pilsener beers.