Bavaria's Reinheitsgebot of 1516 permitted brewers three ingredients only: barley, hops and water. Yeast was invisible then, and unnamed. That decree still shapes what is poured across Munich five centuries later, and it explains why a munich brewery tour here reads less as novelty than as civic archive. The city's brewing houses grew from monastic cellars into industrial powers. Augustiner traces its line to an Augustinian monastery founded in 1328. Hofbräuhaus began in 1589 as the ducal court brewery, established because Wilhelm V disliked the beer available to his household. Paulaner, Spaten, Löwenbräu and Hacker-Pschorr followed, and together the six hold the exclusive right to pour at Oktoberfest — a monopoly defended since the festival's first edition in 1810, when it was staged as a royal wedding celebration on the meadow now called Theresienwiese. At Sterneckerstrasse 2, a narrow burgher's house from around 1327 holds the Beer and Oktoberfest Museum. It is among the oldest surviving buildings in the Altstadt: crooked timber staircases, low beams, plank floors that slope where centuries settled them. The building itself is the primary exhibit. Inside, displays trace malting, mashing and lagering, the copper kettle, the ice cellar and the shift from cloudy brown Braunbier to the pale Helles that now defines the Bavarian table. Oktoberfest ephemera fills the upper floors — early ride posters, waitress steins, ration-era brewing records. Context matters here more than spectacle. Munich beer culture is bound up in the Wirtshaus, the beer garden and the chestnut trees planted to shade cellars before refrigeration existed — the reason those gardens still stand where they do. Any bierführung münchen worth the name moves between these registers: production, architecture, ritual. Guided munich brewery tour tours in the Altstadt link Hofbräuhaus, Viktualienmarkt and the surviving brewery taprooms within a compact grid of streets, and several pair the walk with museum admission, priced at 4 EUR for standard adult entry. The Reinheitsgebot has been amended, litigated and partly overtaken by European law. Wheat, once forbidden to commoners and reserved for the dukes, is now poured everywhere as Weissbier. Yet the underlying idea — that beer is a regulated public good, not merely a drink — remains legible in every cellar, kettle and shaded courtyard the city has kept standing.