MESMUSES aims at designing and experimenting a geographic metaphor for organising, structuring and presenting the scientific and technical knowledge offered to the public by scientific museums. The metaphor is the one of knowledge maps which all together create and offer a cartography of connected or neighbouring knowledge domains. These maps will enable the creation of semantic portals through which users will easily locate information relevant to their current interest, and from which they will navigate either on predefined routes, or on new routes that they will define in a cooperative manner.