In comics, visions of fantastic architecture contributed, along visions of utopia architecture in movies and video games, to the creation of an imaginary fantastic architecture. At the base of these creations there’s an ideational process starting from drawings and that allows to see things and locations not existing yet. In such – not fully explored – context, target is to investigate themes related to ephemeral and fantasy then set up tools for analysis through the research of main archetypes, the identification of the grammar and semiotic who communise message of such architectures. Target is to show, by the mutual exchages among cities and comics, the existence of a cross area inspired to a memory of common architecture, to a similar imaginary, and showing a common interest for ambient mutations.