Every second Sunday of the month you can attend, in the Forest Museum Jan van Ruusbroec in Groenendaal (Hoeilaart), an interesting lecture. Each lecture will be given in Dutch by another guest speaker, all of them experts in their field. In the afternoon a walk with, in many cases, the theme of the lecture, starts from the Forest Museum.

The Solvay family, a famous name in the history of the Belgian industry, not only created a splendid castle but also a fantastic landscape.