Tours of a brewery do not only offer the guest a healthy sampling of their beer but also lessons in the history of the brewery and the science of how they make their stuff. In cities this has become more and more of a tourist attraction, in reality beer is all made with 4 ingredients (barley, water, yeast and hops), but the scale on which they are made varies significantly. Each city has its own style so next time visit the local brewery and see a little part of its history.