On Thursday, September 11, 2025, the State Hall will not open until 10 a.m. due to an event.
Due to an event, the State Hall will be closed on Friday, September 19, 2025, from 5 p.m.
The Austrian National Library's Department of Planned Languages is home to the world’s largest specialist library for interlinguistics, documenting around 500 planned languages. In addition to Esperanto, the most important planned language in the world today, these also include Volapük, Ido, Interlingua and many others. In the department’s reading room you can discover a whole host of books and magazines in planned languages, multifaceted archives and impressive musical recordings and films.
Supre je la dekstra flanko vi povas iri al la Esperanto-versio!
Ever since it was founded in 1927, the Esperanto Museum at the Austrian National Library has held an extensive library, which was given the name “Department of Planned Languages” in 1990. Planned languages – languages that are deliberately created according to specific criteria – are the subject of the scientific discipline that has been known since the start of the 20th century as interlinguistics.
Subdivided by document type, the library holds about 45.000 printed volumes, 30.000 handwritten texts and manuscripts, 22.000 photographs, 4.500 periodical titles, 3.500 museum artefacts, 1.800 posters and 1.700 audiovisual media.
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