gta Archives 

The gta Archives are among the most important research and study centres for 19th- and 20th-century architecture in the world. They are the successor institution to the 'Semper Archives', which the ETH-Bibliothek handed over to the newly founded Institute for the History and Theory of Architecture (gta) in 1967. Since then, further important holdings have been acquired, including the private collections of the key players in Swiss Modernism as well as Sigfried Giedion’s archive and the CIAM archives.

Today the holdings of the gta Archives comprise about 200 private collections, mainly those of German-speaking Swiss architects, architectural historians, theoreticians and photographers. They also include various other collections and archives of professional associations and institutions as well as a large library. With its collection of educational materials from the architectural school at the Federal Polytechnic Institute, selected semester papers and diploma theses, and the holdings of former professors of architectural design, the gta Archives also represent a "collective memory" for the Department of Architecture at ETH Zurich.

The NSL Archives, which are associated with the gta Archives, focus their collecting activities on holdings from regional planners as well as from landscape and garden architects.