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The co-cathedral of Castelsardo, became the seat of the bishopric of Ampurias in 1503. The current building is the result of renovations carried out between 1597, by order of Bishop Giovanni Sanna, and the 18th century. The temple was consecrated in 1622 by Bishop Passamar.

The Co-Cathedral of our Christ the Saviour is a beautiful contemporary architecture building. It was built in 1982 by architect Franc Kvaternik. It was declared co-cathedral of the Diocese of Koper by Pope John Paul II in 2004, being the first co-cathedral in Slovenia.

The co-cathedral of San Pantaleo is one of the main Romanesque monuments in Sardinia. The church stands on a place of active Christian worship since the 6th century, as evidenced by the baptismal font of the first Christians, now preserved under the presbytery. The present building of the Cathedral, however, was built between the 12th and 13th centuries.

The co-cathedral of Ferentino stands on the site of the city's ancient acropolis. The primitive church dates back to the early Middle Ages, built at the time of Pope Paschal I (817-824) on the remains of an ancient Roman temple. It was renovated and restored inside by Bishop Augustine at the beginning of the 12th century. On 29 December 1108, on completion of the work, the relics of the Roman martyr Ambrose, the patron saint of Ferentino, were solemnly transferred there.

The old church of San Julián de Ferrol, through the bull of John XXIII, reached the category of co-cathedral on 9 March 1959. The church was designed by the engineer and naval architect Julián Sánchez Bort in 1763 and construction began in 1765 on the remains of an old Romanesque church and was completed in 1772.

Fossombrone Co-cathedral was originally a Benedictine abbey, almost entirely rebuilt in neoclassical style by Cosimo Morelli d'Imola in 1776-84, with the exception of the 15th-century bell tower. It is characterised by a façade divided into three parts by high pilasters that extend the central part.

The co-cathedral of Guadalajara was built during the 14th century. Its interior consists of three naves that communicate with three porticoes. The main altarpiece in Renaissance-Mannerist style is by Francisco Mir. The bell tower is covered in brick and has eight bells: one from the 18th century, two from the 19th century and five from the 20th century.

The Basilica Cathedral of Mondoñedo, built in the 13th century, is nicknamed the "kneeling cathedral" because of its perfect proportions and low height. The cathedral has several styles due to the successive extensions and reforms over time. It was built on Romanesque foundations, although it underwent Baroque extensions. Inside is the cathedral and the diocesan museum "Santos San Cristóbal", founded in 1969, which has important works of religious art, being one of the most important of its kind in Galicia.

The Cathedral of the Memory of the Seven Sorrows of Mary is a functionalist church that was built between 1939 and 1942. The architects of the church were Gabriel Schreiber and František Florians. At the time of its consecration on 8 September 1942, the interior fittings and the tower were still missing.

The co-cathedral of San Donato was built from 1575 on the ruins of an earlier church that was elevated to the rank of cathedral of the diocese of Acerno in 444 by Pope Leo I. As a result of several seismic events, particularly that of 1980 and a subsequent fire, the structure underwent numerous structural modifications. With a renovation project in 1989, the church was completely restored and reopened for worship.