Adelwein Kunst collection of paintings, watercolors and drawings, dating from the last quarter of the 19th century to the 20th century.

The emphasis in the collection is on the followers of the Hague School, in particular the 'Hague Watercolourists', including work by Herman Bogman, Piet van Boxel and Rudolf de Bruyn Ouboter.

Also included is work by artists from the artist associations 'Hollandse Aquarellistenkring', 'Arti et Amicitiae', 'Pulchri Studio' and 'Haagse Kunstkring' and work by the Dutch impressionists and friends of Vincent van Gogh, Arnold Hendrik Koning and Edzard Koning.