The Basilica of Saints Nazarius and Celsus is a romanesque-gothic minor basilica, located in the citadel of Carcassonne. The original church is thought to have been constructed in the 6th century during the reign of Theodoric the Great, ruler of the Visigoths.
On 12 June 1096, Pope Urban II visited the town and blessed the building materials for the construction of the cathedral. Construction was completed in the first half of the twelfth century. It was built on the site of a Carolingian cathedral, of which no traces remain. The crypt too, despite its ancient appearance, dates from the new construction.
Around the end of the 13th century, during the rule of kings Philip III, Philip IV, and the episcopates of Pierre de Rochefort and Pierre Rodier, the cathedral was reconstructed in the Gothic style. It remained the cathedral of Carcassonne until 1803, when it lost the title to the present Carcassonne Cathedral.
The Church of Saints Nazarius and Celsus obtained the status of historical monument in 1840. Around this time, the architect Eugène Viollet-le-Duc renovated the church along with the rest of the citadel. In 1898, the church was elevated to a minor basilica.
The sandstone basilica's floor plan is based on a Latin cross, internally measuring 59 m in total length, 16 m in nave width, and 36 m along the transept. The oldest part of the church is the Romanesque tripartite nave. The main entrance in its north wall is formed by a Romanesque portal of five receding arches over two doors. A fortress façade forms the west wall, as is common for medieval Languedocian church buildings.
The transept and choir were rebuilt in the Gothic style. The larger windows in this part of the church permit a better illumination compared to the darker romansque nave. The central stained glass window of the choir from 1280 is one of the oldest ones in the south of France. Together with the upper trefoils (the Resurrection of Jesus and the Resurrection of the dead), it depicts the life of Jesus in 16 medallions.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.