25 Euro Carles Buïgas

Carles Buïgas designed the illuminated fountains of Montjuïc for the 1929 Barcelona International Exposition, a commission he won at age 26 after submitting plans so ambitious the city initially doubted they could be executed. The fountains opened on the exposition's inaugural night — 3,000 jets, coordinated color lighting, and a central geyser reaching 50 meters — and remain operational today largely on his original hydraulic engineering.

This coin was issued the year after Spain joined the Eurozone convergence process, one of the last silver commemorative series struck under the peseta before decimal coinage was retired in 2002.