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Aversa Cathedral was built between 1053 and 1090 and is in the Romanesque style, with the notable exception of the façade. The façade is Baroque in style and was built in the early 18th century after earthquakes caused the collapse of much of the building between 1694 and 1702.

The Cathedral of St. Bartholomew the Apostle, also known as the Cathedral of the Marsi, was built between 1930 and 1942. The city of Avezzano has at least four cathedral churches dedicated to Apostle Bartholomew, built over the centuries. All of them had to cope with the earthquakes that devastated the region.

The Church of San Pietro in Consavia, or Baptistery Complex of San Pietro, consists of four buildings dating from the 12th and 14th centuries. It was Bishop Landolfo di Vergiate who, after 1100, began the construction of the first buildings, as a copy of the holy sepulchre. Between the 13th and 14th centuries, the church was endowed with a side building that formed a courtyard. Deteriorated and disfigured over the centuries, a restoration between 1930 and 1932 brought the church back to its former medieval structure. At the same time, an Archaeological Museum was placed there, and has recently moved to Palazzo del Michelerio.

The Baptistery of Neon (also known as Orthodox Baptistery) is an early Christian baptistery. It is has an octagonal shape and is thought to have been built over a Roman bath. It belonged to a basilica that was destroyed in 1734. The ceiling is decorated with a mosaic depicting the baptism of Jesus.

The present cathedral of Bari dates back to the 12th-13th century. It was built on the ruins of a cathedral of Byzantine origin, destroyed by William I of Sicily (1154-1166). The materials of the previous church and other destroyed buildings were used for the construction of the present building. Consecrated on October 4, 1292, the church was inspired by the style of the Basilica of St. Nicholas.

Barletta Cathedral was built between the 12th and 14th centuries on the site of an early-Christian church, which had been in existence since the 7th century at least. The church was consecrated as a cathedral by Pius IX in the Bull of 21 April 1860 and became a minor basilica in 1961.

The co-cathedral basilica of Saint Agatha was built in Romanesque style in the 12th century, but the present baroque church dates from a reconstruction from 1629 to 1696. The work was entrusted to the local builders Francesco Bischettimi and Scipione Lachibari, according to Giovan Bernandino Genuino's design for the whole building. Due to the large number of paintings, the interior can be considered a real gallery of paintings.

The Basilica of Santi Bartolomeo e Gaetano is a Renaissance church built between 1516 and 1694 on top of an ancient church from the 5th century. In 1516, the architect Andrea Marchesi was commissioned to build the present building. The project, which is detailed in the outer portico of the complex, was interrupted at his death. In 1599, the church came under the direction of the Theatines, who completed the construction in the 17th century under the direction of Giovanni Battista Natali and Agostino Barelli.

Santi Cosma e Damiano is one of the oldest churches in Europe. Erected in the 6th century on the remains of a Roman temple, still visible today, the apse of the basilica has preserved mosaics of the time.

The Collegiate Basilica of Saints Gervasius and Protasius was first consecrated in 1118 by Pope Gelasius II during his visit to France. Restoration and transformation work began in 1606 and was completed on 2 June 1628, after twelve years of work, preserving the four-aisle structure. Further work was carried out in 1679 to allow for the construction of a new apse, which resulted in the cancellation of the earlier Gothic-Romanesque architectural aspect, taking on its present 18th-century appearance. Further substantial changes were made in the second half of the 19th century with the reconstruction of the interior and the new neoclassical façade by the architect Gio Batta Olivieri between 1852 and 1856.