SIS Germany School Locations SIS Kassel Teambuilding in the woods SIS Kassel students have a great time in the climbing park Our grade 8 class went to the climbing park Kassel in the beautiful "Habichtswald". After a short training on how to be safe in the climbing parcours students climbed off in groups of two or three. A lot of different skills were required to master the different levels of the parcours and our students had a great time!