This documentation of a planned urban expansion in Melk investigates the central design projects of the Austrian architects Max Fellerer and Eugen Wörle during the domination of National Socialism in Austria. Despite the significance of their work in the postwar period, a well-founded architectural analysis of the work in the 1940s is still missing, which is in depth attributed in this thesis. The basis for this investigation is the plan material of the Archiv Wörle, preserved at the Architekturzentrum Wien, which comprises the majority of designs by Max Fellerer and Eugen Wörle, prepared during this period and is composed of a vast variety of diverse drafts. Based on former development programs such as the Generalregulierungsplan by Robert Oerley and the Vorprojekt für einen Bebauungsplan by Alfred Otto Felsenstein, the fundamentals for the urbanistic development by Fellerer and Wörle is clarified and discussed in this work, in order to analyse the varying expansion and design mechanisms around the Nibelungenlände and Melker Vorstadt as a next step. In particular, the differing architectural and stylistic design attempts in the plans during the interwar period and the 1940s are pointed out. Not only the question if their designs are to be interpreted as part of an architectural discourse, controlled by the national socialistic regime, or as part of an interwar modernism, but also the reappraisal of the historic, economic and mythical significance of Melk during the Nazi regime in Austria, with regards to the medieval epic of the Nibelungs, as suspected base for the planned urban expansion, are highlighted. This thesis, through combining a mythical occupied network by architectural manifestations within the Danube areas, investigating the Nibelungs epic as source of a newly created and totalitarian characterized Nazi epic piece, is ultimately leading to a critical review about the architectural styles within the Third Reich and an intensified analysis about the design developments of the Nibelungenlände in Melk.