Knowledge maps are useful tools for managing and sharing the large-scale hierarchical knowledge that have recently started to be widely applied. In this paper, we discuss how knowledge maps can be generated by using Memory Islands. Memory Islands is our work on progress visualization technique, which was inspired by the ancient "Art of Memory". It consists of automatically creating the spatial cartographic representation of a given hierarchical knowledge (e.g., ontology) and with the help of its interactive functions, the users can navigate through the artificial landscape, to learn from the knowledge and retrieve them. We present some preliminary results of representing different hierarchical knowledge to show how the knowledge maps created by our technique work. We would like to discuss with the Information Retrieval community about interactive functions such as searching.