Piazza Armerina Cathedral is dedicated to Mary of the Victories (Maria Santissima delle Vittorie). It is the seat of the Bishops of Piazza Armerina.
Built on the foundations of an earlier church of the 15th century and based on a design by architect Orazio Torriani, its construction began in 1604 and ended in 1719, while the dome was added in 1768. It became the seat of the Diocese of Piazza (later Piazza Armerina) when it was created in 1817.
The interior of the cathedral is dominated by the central dome. It contains a cross painted on both sides, showing the crucifixion and resurrection of Christ, and a baptistery by Antonello Gagini.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.