The Kunstmuseum Den Haag — formerly the Gemeentemuseum — is one of the best art museums in the Netherlands, with a collection that runs from medieval applied art through Impressionism to the present day. The Mondrian collection is exceptional and justifies the trip on its own; nowhere else can you trace his development from naturalistic painting to pure geometric abstraction so completely.
Beyond Mondrian, the museum holds significant works by Monet, Picasso, and the Hague School painters who documented 19th-century Dutch life, along with an extensive decorative arts collection covering furniture, fashion, glass, and ceramics. The building itself — a brick-and-concrete structure in a park in the Statenkwartier neighbourhood — is a major work of early modern Dutch architecture. Located about 2 km northwest of the city centre; tram 17 from Centraal Station stops nearby.