St. Domnius Cathedral, located in Split, Croatia, is a Roman Catholic cathedral dedicated to Saint Domnius, the patron saint of the city. Originally built as a mausoleum for the Roman Emperor Diocletian in the 4th century, it was later converted into a cathedral in the 7th century. The structure showcases a blend of Roman and early Christian architecture. The cathedral features a distinctive bell tower, which stands at 57 meters tall and offers panoramic views of the city. Inside, visitors can find beautiful stone carvings, ancient artifacts, and a serene atmosphere that reflects its long history and significance to the local community.