Otto Wagner continues to combine academic geometry with classical modified Art Nouveau decoration in his Karlsplatz Stadtbahn Station (1899­-1901).

The buildings above ground on Karlsplatz are a well-known example of Jugendstil architecture.

These buildings are included in the Vienna Secession, as they follow many of the artistic styles of that movement.

Designed by Wagner, adviser to the Transport Commission in Vienna, and Joseph Maria Olbrich, they are, unlike the other Stadtbahn stations, made of a steel framework with marble slabs mounted on the exterior.

These stations allow Wagner to achieve his goal of creating two modern axes of architecture in a city that is becoming one of the most modern cities of its time.

These buildings will go on to become the most modern monument of the modern city.