Explore! is an m-learning system that aims to improve young visitors' experience of historical sites. It exploits the imaging and multimedia capabilities of the latest generation cell phone, creating electronic games that support learning of ancient history during a visit to historical sites. Explore! consists of two main components: 1) the Game Application running on cellular phones, to be used during the game and 2) the Master Application running on a notebook, used by the game master (i.e. a teacher) to perform a reflection phase, which follows the game. Having the Game Application been described in previous papers, in this work we mainly illustrate the Master Application.