Österreichische Postsparkasse: interior
by WAGNER, Otto, Photo
The central space of the banking hall (modified 1980s) had a glass vault of stilted elliptical sections carried on riveted steel columns and a floor with glass lenses to light the basement below.
The building had little decoration; it is recognized as a milestone in the history of modern architecture, particularly for the curving glass roof of its central hall.
The photo shows the skylight in the main hall.