Deutsches Fußball Museum is Dortmund's national museum of German football, covering the national teams, Bundesliga culture, tactics, trophies, media, and supporters. In a city where football is part of civic identity, it feels especially well placed.
It is worthwhile even if you are not a Borussia Dortmund supporter, provided you have some interest in the sport. Pair it with Signal Iduna Park or a match weekend for the full football context.