The goal of this project is to augment the visitor's museum experience using digital technologies. For this purpose, the authors have been investigating and developing several systems which can be classified into two categories: (a) mixed reality displays and (b) experience support systems. As for (a), this paper illustrates three systems to superimpose virtual images onto physical exhibits: ExFloasion, Bousight Table, and FloasionTable. Their key feature is the optical design for providing 3D visual effect without any special glasses. They are useful for giving visitors some intuitive explanations of physical exhibits at museum. In addition, the authors consider that total (before and after) services are very important as well as the on-site (at museum) one. The category (b) includes networked visualization of congestion situation (Breathing Museum), social networking to share visitors' feelings (Post-Visit Board), and personalized mementos for each visitor (Peaflet). They are effective for making people want to visit museums and promoting greater understanding. This paper gives a brief overview of these systems.