0 Euro SWR Fernsehturm Stuttgart

The zero-euro souvenir note exists entirely outside the monetary system — it is legal in the EU precisely because it carries no face value, sidestepping regulations that govern actual currency reproduction. Euro Banknote Memory, the French company that dominates this niche, produces these for tourist sites and regional broadcasters across Europe, each run typically limited and serially numbered to give collectors a reason to care about one edition over another.

The SWR Fernsehturm Stuttgart, opened in 1956, was the world's first television tower built from reinforced concrete — a distinction that still matters to engineers and broadcasting historians alike.