Bologna's churches and religious complexes represent architectural masterpieces spanning Byzantine, Romanesque, Gothic, Renaissance, and Baroque periods, housing priceless artworks and serving as spiritual centers for centuries.
The Basilica of San Petronio dominates Piazza Maggiore as one of the world's largest churches (132m long, 66m wide). Construction began in 1390 to rival St. Peter's. The striking incomplete marble facade contrasts finished lower sections with exposed brick above. Inside, 22 chapels feature works by Giovanni da Modena and Lorenzo Costa. The world's largest sundial (1655) stretches 67.7 meters. Here, Pope Clement VII crowned Charles V in 1530.
The Basilica of Santo Stefano complex, known as 'Sette Chiese' (Seven Churches), comprises interconnected medieval structures creating a unique architectural ensemble (5th-13th centuries). Four main buildings remain: the Church of the Crucifix, octagonal Church of the Holy Sepulchre (modeled after Jerusalem), Courtyard of Pilate with its 8th-century basin, and Church of Vitale and Agricola (Bologna's oldest, 5th century). The tranquil Benedictine Cloister enhances the mystical atmosphere.
The Basilica of San Domenico is the mother church of the Dominican Order worldwide and burial site of Saint Dominic (died 1221). The Arca di San Domenico shrine ranks among Italy's finest sculptural ensembles, begun by Nicola Pisano and featuring contributions from young Michelangelo (three figures at age 19) and Niccolò dell'Arca. The church displays works by Guido Reni, Ludovico Carracci, and Filippino Lippi, plus King Enzo's tomb.