This paper describes one of our measures to raise students' interest for Computer Science (CS) and to provide them with a realistic idea of the field. We outline the underlying concepts and theories of InfoSphere - the extracurricular learning environment for CS at RWTH Aachen University. After explaining the theoretical, organizational, and infrastructural foundations, we provide an overview over the didactical concept of our 13 different CS workshops for school students of different ages. Furthermore, we introduce the benefits of InfoSphere for our three different target groups: school students, university students in teacher training, and active CS teachers. Finally, we present first results from our ongoing evaluation of the school students' perception of the field of CS before and after visiting one of the InfoSphere workshops.