0 Euro - Château de Bouillon

The Château de Bouillon souvenir zero euro note is part of the scheme launched by French entrepreneur Richard Faille in 2015, with Oberthur Fiduciaire — one of Europe's established security printers — producing the notes to genuine banknote specifications, including the security thread and microprinting. The legal denomination of zero ensures no central bank authorization is required, sidestepping the regulatory framework that governs actual currency entirely.

Bouillon's medieval fortress, perched above the Semois River in the Belgian Ardennes, is among the more historically loaded castle sites in western Europe — Godfrey of Bouillon, who led the First Crusade in 1096, held it before pawning the lordship to the Prince-Bishop of Liège to fund the expedition.