since 2005, the museum has been located in the baroque palais mollard-clary. the museum holds around 35,000 library volumes, 3700 periodical titles, 3500 cultural artifacts, 10,000 autographs and manuscripts, 22,000 photographs and photographic negatives, 1500 posters, and 40,000 pamphlets. in all, approximately 500 various planned languages are documented, of which the most important is esperanto.