Built between the 7C and 8C by monks from the east and altered in the 9C, this basilica was one of the first Christian churches in Italy. Its architecture reflects a successful merging of Classic and Eastern styles, an original combination which has led to the building being declared a UNESCO World Heritage Site in 2011. The interior is striking for its simple elegance and its many Roman features, such as the columns, which have been re-used in the church's construction.