100 Euros St. Leopold's Church at Steinhof

Part of Austria's long-running "Room of Art and Architecture" gold series, this issue marks the centenary of Otto Wagner's Steinhof church, completed in 1907 on the grounds of the Lower Austrian State Mental Institution in Vienna. Wagner fought the imperial bureaucracy for years to realize the building — the Secession-influenced design was considered wildly inappropriate for a psychiatric facility, and church authorities objected to nearly every structural decision.

The church was, notably, one of the first in Europe designed with the practical needs of mentally ill patients explicitly informing the architecture — sloped floors, rounded pew ends, separate entrances.