
It was held 23-7 until 12-8-2008 at the CICG, Geneva. It was planned to be held in Nairobi, Kenya. But political unrest resulted in the congress being relocated.
It is difficult to recognise that building in the picture. However, tThe fountain looks like that in lake Geneva.
Here is a clear pic of the CICG that coincides with the image of the building of the stamp. The vicinity of lake Geneva appears a bit of artistic freedom.

By the way: one year in the title, another in the description.