With only a few Japanse gardens in the Netherlands, the one in my hometown is often named the most beautiful, see for yourself why:

Located on the Clingendael estate in The Hague, stunning in itself already, and named a state monument. The Japanese Gardens can be visited free of charge, but unfortunately only open to the public 6 weeks a year, during end of April-start June, and 2 weeks in October, when the gardens are in full bloom.