This paper deals with the cult and veneration of St. Šime in Zadar, primarily with a historical overview and institutional opinion and further development up to the present day with a special focus on holiday celebrations and pilgrimages to this shrine, whether touristic or religious. Zadar, a city with a long and rich history, its patron saints and their relics offers fertile ground for researching the complexity of the cult of St. Šime. His body, which is about 2,000 years old and has been in Zadar since the 13th century, has been worshiped, guarded and still shows great interest in the community. Visitors come for relics, to participate in holiday celebrations and rituals. The aim of the research is to observe the wealth of spiritual heritage that is passed down through the generations. Using the method of ethnographic field research, including the interview with the priest, pastor of the parish of St. Šime and theologian, Assoc. Ph.D. Damir Šehić, participant observation and document analysis, data was collected about daily mass celebrations, holiday celebrations, pilgrimage practices and religious rites in this cult. The results show that the essential elements of the cultural identity of the cult of St. Šime remains preserved through the active participation of pilgrims and believers in joint activities. The faith and perseverance of the pilgrims largely make this cult sustainable and influence its spread, both locally and abroad.