The New York Times reported yesterday on this intriguing exhibit of fake artworks in Pisa. Wish I were in Italy to see it!
https://www.nytimes.com/2024/11/13/world/europe/italy-art-forgeries.html?unlocked_article_code=1.Z04.HkMq.yIMCcFU52y7H&smid=url-share
That would be fun to see; I can't immediately find any info online about how long the exhibition will be running.
Vienna has an established, though privately run and rather small, museum of fake art, the Falschermuseum (Museum of Art Fakes): https://www.faelschermuseum.com/. I enjoyed seeing it earlier this year.