The Panhellenic sanctuaries, such as those at Olympia, invited participation from all Greeks and became an international stage for competition and display. NonGreeks made a variety of dedications in the Panhellenic sanctuaries, but only Greek cities dedicated small buildings known today as treasuries. It is the treasuries that offer the most promising place to begin a discussion of architectural internationalism. This chapter first presents the history and topography of Olympia. In an investigation of architectural style at Olympia, the first step is to establish the identity of the buildings with extant remains; next comes a consideration of the historic and cultural contexts associated with their construction. The chapter then deals with the treasury at Sikyon. The Sikyonian treasury is a securely identified building constructed of stone that may have been quarried locally and brought to Olympia. The chapter also talks about the treasuries at Syracuse, Epidamnos, Selinous and at other places.