25 ECU Antoni Gaudí

The ECU — European Currency Unit — was never legal tender in the conventional sense; it existed as a basket currency, a weighted average of EC member currencies used primarily for accounting and financial instruments. Spain's decision to issue commemorative coins denominated in ECU was largely a political gesture toward European integration, and the series ran through the early 1990s before the unit was absorbed into the euro conversion framework in 1999.

Gaudí died in 1926 after being struck by a tram in Barcelona — initially unrecognized, he was taken to a pauper's hospital.