The theme of accessibility has assumed considerable importance for the fruition of cultural heritage, evolving into the more extensive and sensitive concept of “extended accessibility”. In this way it is possible to overcome the concept of “architectural barrier” intended in the reductive sense of physical obstacle, giving the same importance to all those barriers that are still neglected or even ignored today, such as psycho - cognitive, sensory and communicative ones. Therefore, designing the extended accessibility means putting the human being with all his/her needs and requirements at the centre of attention. From this point of view, five main declinations can be identified, physical, cognitive, alternative accessibility, sensoriality and visibility catalysts, each of which has a fundamental role for the usability and enhancement of cultural sites. For each declination, a case study was analysed in which the topic was addressed by proposing different solutions able to give a concrete answer to these various problems. Finally, a case study has been examined, the Nuragic Sanctuary of Santa Vittoria di Serri, highlighting the main problems in terms of accessibility and studying a series of solutions that could improve the usability of the archaeological area. What has been analysed clearly highlights how there is no contrast between accessibility and usability and protection of cultural heritage, but how these aspects can coexist and indeed contribute to the improvement of the cultural opportunities.

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