My attention was drawn to an unusual building on the square - as it turned out, the former station of the city railway. The station on Karlsplatz was built in 1899. This building was created by the famous Austrian architect Otto Wagner with the participation of Josef Maria Olbrich. The building of the Stadtban station consists of two pavilions connected by a high arch with a central entrance and is a striking example of Art Nouveau architecture. When in 1981 the railway lines turned into a subway, ? ? this original station was in danger of demolition, but due to public protest, local authorities decided to leave it.→