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The Monastery of Clonmacnoise, also known as the "Seven Churches", was founded around 544 by the one who would later be known as one of the twelve apostles of Ireland, Saint Ciarán. The wealth of the monastery attracted the lust of Irish kings, Anglo-Normans and Vikings who plundered and burned it many times between 841 and 1204. The decline of the road bordering Clonmacnoise in favour of the one passing through Athlone around the 11th century marked the beginning of the decline of the site. In 1552, the English garrison of Athlone sacked the monastery. Three high crosses still stand on the site of the monastery, the "Cross of the North", the "Cross of the South" and the "Cross of the Scriptures", dating from the 9th to the 10th century.

St Colman's Cathedral, dating from the 13th century, is the historic cathedral of the diocese of Cloyne, founded in 887. At the Reformation, the church became Protestant and the Catholics moved the seat of the diocese to Cobh Cathedral.

The Cluj-Napoca Evangelical Church was built between 1816 and 1829 and blends baroque elements with neoclassical style. In its walls were incorporated the stones of the so-called Round Bastion.

The Franciscan Church of Cluj-Napoca is one of the oldest and most important places of worship in Cluj, dating back to the 13th century. The building is classified as a historical monument.

The Neologos synagogue is a mosaic place of worship built between 1886 and 1887 in the Moorish style. It is now known as the temple of Jewish deportation. After the dictation of Vienna (1940), when Hungary occupied northern Transylvania, the synagogue was turned into a warehouse. After the Jews were deported to the Nazi camps, the synagogue was badly damaged in June 1944 due to bombing. The synagogue was later restored in the 1950s.

The Piarist Church, originally known as the Cluj Jesuit Church or University Church, is the first Catholic church built in Transylvania after the Protestant Reformation (16th century). The church, built between 1718 and 1724, is a Baroque architectural ensemble where the central building of Babeş-Bolyai University is located today.

The Abbey of Cluny, founded in the 10th century, quickly became the most important Benedictine monastery in Western Europe, triggering a revival of monastic practises on the continent. Until the 12th century, the Abbey of Cluny governed monastic life in Europe and gave birth to 1800 sites throughout western Europe. Due to its rapid growth, the buildings of the abbey were modified on numerous occasions, notably during the reconstructions from 963 to 981 and from 1080 to 1220. The last reconstruction made the abbey the largest Christian building in the world until the construction of St Peter's Basilica (1506-1626). The monastery was dissolved in 1790 and was largely destroyed during the French Revolution. The large library and archives caught fire in 1793 and the church was looted. The present remains of the monastery represent about 10% of the total area of the third abbey (1080-1220). Since 1901, the former monastery has been part of the École Nationale Supérieure d'Arts et Métiers (ENSAM).

The co-cathedral of Aquino dates back to the 11th century but during the bombing of the city in 1944 the cathedral was seriously and irreparably damaged. Thus, the present building is a post-war construction. The church was the cathedral of the diocese of Aquino until 30 September 1986, when it became the co-cathedral of the diocese of Sora-Cassino-Aquino-Pontecorvo.

The present cathedral of Ascoli Satriano was built in the second half of the 13th century by the Conventual Friars Minor, who dedicated it to Saint Francis, with their adjoining monastery. With a bull dated 24th September 1455, Pope Callistus III raised the Franciscan church to the rank of a new diocesan cathedral, replacing the previous one, which was destroyed by an earthquake. The new cathedral was enlarged and restored during the 17th century and was reconsecrated on June 3, 1709. It was finally completely rebuilt after the earthquake of 1871 which reduced it to ruins.

The co-cathedral of Bertinoro stands on the site of a small oratory, which was demolished at the end of the 16th century. It was built in the style of Bramante by order of Bishop Giovanni Andrea Caligari and was completed in the 17th century.