The Berlin Art Library (German: Kunstbibliothek Berlin), Germany, is an agency of the Berlin State Museums under the auspices of the Prussian Cultural Heritage Foundation. It has approximately 400,000 volumes and ranks among Germany's leading institutions specializing in the literature of Art History. The library is located on the Kulturforum in Berlin-Tiergarten, Germany and attracts 35,000 visitors annually.
More information on the Wikipedia page 
The website, in German, is []