This chapter examines the permanent structures (theaters, amphitheaters and circuses) that were developed during the Republican period in order to house the variety of public entertainment events. The refinement and monumentalization of the public entertainment structures from the Middle to the Late Republican period coincided with Rome's military expansion and the victorious wars abroad. The importance acquired by public entertainment promoted the advancement of permanent structures for the various types of events. New techniques enabled designers to refine Greek theater design in order to satisfy the specifics of the Roman spectacle and audience, as well as to create the novel architectural forms of the amphitheater and the circus to accommodate the needs of the games that were taking place in them. In doing so, they created monumental structures that dominated the landscape and defined the urban character of Republican settlements.