MovE

Poster for 'Circus De Jongh', 1953 (Het Huis van Alijn)

Poster for 'Cirkus Tondeurs', 1944 (Het Huis van Alijn)

Poster for 'Cirkus Minnaert', 1954 (Het Huis van Alijn)

Recently, while surfing the web on holidays, I discovered interesting website - MovE (only in Dutch).
It collects more than120.000 items from 48 museums and apparently it is the biggest online archive in Flanders (Belgium).