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In this paper, a multimodal dialogue system architecture is presented. The cultural heritage application of the software makes it important to use different channels of communication to enable museum visitors to naturally interact with it and still enjoying the artistic environment, whose exploration is supported by the system itself. A question answering system for the 3D reconstruction of the Absis and Presbytery of the San Lorenzo Charterhouse (Padula, Salerno) is considered as a case study to demonstrate the capabilities of the proposed system. The implemented multimodal fusion engine will be described along with the strategies adopted to involve multiple users in an immersive, interactive environment supporting queries and commands expressed through speech and mid-air gestures. The collected feedback shows that the system was well received by the users.