0 Euro - Castle of Bouillon

The 0 Euro souvenir note program — operated under license from the European Central Bank — was launched by EuroSouvenir in 2012 and has since become one of the more commercially successful philatelic novelties in modern Europe. Each note is legal in design but carries no monetary value, printed by Oberthur Fiduciaire to genuine banknote security specifications, including genuine cotton-blend substrate and UV-reactive features. The program's credibility hinges entirely on that production quality; a cheap-looking souvenir would kill the concept.

Bouillon's medieval castle, perched above the Semois river in the Belgian Ardennes, was among the more historically defensible fortifications in the region — associated with Godfrey of Bouillon, who led the First Crusade in 1096 before the castle passed through successive feudal hands.