The Archbishop's Palace is a castle and palace in the city of Trondheim, located just south of the Nidaros Cathedral. For hundreds of years, the castle was the seat, residence and administrative center of the Archbishop of Nidaros.
The castle is one of the largest medieval stone structures in Scandinavia and the oldest walls are likely from the 13th century. The Archbishops of Nidaros expanded the castle gradually, with great halls and residential areas being built over time. Norway’s last Archbishop, Olav Engelbrektsson, attempted to make a final stand and defend the castle during the Reformation but eventually fled into exile.
After the abolishment of Roman Catholicism, the castle became royal property where the local lensherre resided. The castle was restored, rebuilt into a residential palace and eventually used more for military purposes, again being expanded considerably. After the Sovereignty Act of 1660, the castle became the seat and residence of the Amtmann.
Today, the castle has several museums, is frequently used by the Church of Norway and is also the venue of Olavsfestdagene. The Regalia of Norway have been kept in the western flank of the castle at various times since 1826, but have been on permanent display in the castle since 2006.
'The Armoury' (Rustkammeret) is a Norwegian army museum as well as a resistance museum, emphasizing the military history of Trøndelag. Military equipment of Norway during World War II at display in the 'Armoury' Army Museum in Trondheim. The museum has weapons, uniforms and other artifacts on display, starting with the Viking Age, going through the Middle Ages and the Norwegian union with Denmark (1380–1814) and later with Sweden (1814–1905), up to the German occupation of Norway during World War II (1940–1945).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.