As part of the celebrations of Vienna's Belvedere Palace on the occasion of its 300 years anniversary, the result of a long-lasting research work has been presented: The exhibition archive since 1918 has been digitzed and made available online. You may replay all the old exibitions, download the catalogs, and much more.
https://sammlung.belvedere.at/exhibitions
It is not available in English, yet. The introduction reads as this:
"Explore more than a hundred years of exhibition history at the Belvedere! A selection of in-depth projects provides insight into historical and current exhibition practice and at the same time reflects the diversity of the collection. The exhibitions recorded are continually supplemented with accompanying texts, image documentation and digital copies of the catalogs. This ongoing processing makes it possible to view the Belvedere's exhibition program online."