The most important building in Nesvizh is the Corpus Christi Church. It is connected with the castle by a dam over a ditch. It has coffins of 72 members of the Radziwill family, each in a simple coffin made of birch and marked with Trąby Coat of Arms. Designed by the Italian architect Gian Maria Bernardoni, the church is said to be the first Jesuit temple patterned after Il Gesù in Rome. It is the first domed basilica with Baroque facade in the world and the first baroque piece of architecture in Eastern Europe.