Access to real environments is often conditioned by a number of issues, including the skills of the user (i.e. affected by aging, physical and psychological deficiencies, etc.) and the complexity of the real environment itself. This work proposes an approach for helping users with different skills, including elderly people, to navigate through complex real scenes; such approach is based on the semantic description of the objects and zones that characterize the environment itself and takes advantage of an implementation architecture based on web standards for generating navigational support. A case study related to the creation of a guided tour through the indoor and outdoor locations of the city of Venice, accessible through a multimodal web browser, is presented. Categories and Subject Descriptors H.3.1 [Information Storage and Retrieval]: Content Analysis and Indexing