The design of an open-air stage in the historic center of Naples is the topic of this thesis. With close to one million inhabitants Naples is the third largest city in Italy. The capital of Campania is both economic and cultural center of southern Italy. In the surrounding metropolitan area, which is one of the most densely populated areas of Europe, live up to 4.4 million people. 1995 the entire historic center of Naples was declared as World Heritage of the UNESO. This makes a architectural intervention to a particularly exciting task. In the density of the city, the public space is the stage of the Neapolitan. This special nature of Naples residents is the cause for planning an outdoor stage. The facility will enhance the public space by a stage, which will serve professionally organised performances, as well as spontaneous everyday interventions. The selected property is located in a side street of the famous -Spaccanapoli-, one of the most popular promenades for tourists. This backstreet is called -Via Grande Archivio- and has been re-drafted through a monastery in the course of urban development about a century ago. The now opened cloister courtyard, which is currently occupied by a ruin from the 60s, serves as a site for the open-air stage. The project proposal embeds itself into the former monastery ensemble, so that the basement is filling up the former courtyard just to the lower edge of the cloister columns. A new court is created on top of the basement, directly attached to the historic cloister vault. On one side the stage is modelled into the basement and on the opposite side the grandstand is raising up. Structures of the existing building are quoted, reinterpreted and generate in combination with a flexible textile roofing a public space for play and watch. The slope of the adjacent street is revealing the basement, in which the vestibule, administration, workshops and the artist area are integrated.