The presented master thesis proposes a design for the adaption an extension of the Wien Museums on Karlsplatz which was built between 1954 59 according to plans by the architect Oswald Hardtl. The methodical guiding theme which was applied to develop the architectural design is called “From Sequence to Consequence”. Thereby specific spatial sequences concerning the site, the existing museum as well as the task of building a museum are analyzed at first. The derived consequences on different scales form the conceptional framework of the then proposed design solution. In that sense the first chapter AREAL KARLSPLATZ looks at the urban context of the Wien Museum in its historic development with a special focus its the relation to the former defense ring, the Glacis and the Ringstraße. Subsequently, in chapter GENUIS LOCI, the derived formulation and answering of four key questions the question of Karlsplatz, the question of St. Charles Church, the one of how to build a museum nowadays and the question of relating the previously asked to each other form the conceptional precondition for the architectural design. The chapter RAUMSEMANTIK gives an overview over the historic, architectural visions as possible answers to the mentioned key questions. The structure of the existing Wien Museum and its neighbor, the so-called Winterthur Building gets analyzed and the requirements for the new Wien Museum are presented based on the open design competition in 2015. An overview of the current collection of the Wien Museum closes the theoretical part of the thesis in chapter SAMMLUNG. The finally presented architectural design draws the spatial conclusion through its urban implementation and through the spatial, material and formal design concept for the new Wien Museum.