The Church of Our Lady is one of the largest churches of Aarhus, Denmark. The church was originally known as St. Nicholas' Church but was expanded by the construction of a Dominican priory in 1240, the Vor Frue Kloster (Our Lady's Priory), of which the present church formed the southern wing. After the Reformation in Denmark, the name was changed to the Church of Our Lady and King Christian III decreed that the surrounding buildings, formerly a priory of the Dominicans, should function as a hospital for the sick and poor. The church was subsequently granted congregational privileges which officially made it a centre for clerical activities in its area.
Between 1250 and 1500 the church was heavily expanded by the addition of, among other things, the large tower. In the 1950s a crypt-church was rediscovered beneath the church during renovations. The crypt church dates to approximately 1060 AD. The church has since been renovated again in 2000.
The crypt church is the oldest extant stone church in Scandinavia. Built in 1060 after the old wooden church had been burned in an assault on the town, the church is situated beneath the main building of the Church of Our Lady. After its discovery in the 1950s, it was restored and reopened on 10 November 1957 and is now used for mass once a week.
During the restoration by the Danish National Museum, two graves were found - one of a child and one of an adult - and 23 coins from the 14th century. Five of these coins were from Lübeck and the rest from Hamburg.
The crypt church was initially built as an attempt to weaken Adalbert, archbishop of Hamburg-Bremen, who had considerable influence on Danish clerical matters, as the head of the Danish church. Svend Estridsen (1047–1074) divided Denmark into 8 bishoprics, and in 1060, Christian became the first bishop of Aarhus. The crypt church was built the same year.
Around 1080, a new and larger church was built here, named after Saint Nicholas, just like numerous other Danish churches of the time. In 1180, it was mentioned as Aarhus' first cathedral, but was demolished when the Dominicans came to town.
There is no historic information about the crypt church from the following centuries. At some point the rooms were walled off and used as a storage room, until the church itself was forgotten.
The exact year for the erection of the Dominican priory is not known. Different sources point both to the years 1227 and 1239; it is generally assumed that the priory was fully established by approximately 1240.
The priory was separated from the Church of Our Lady during the Reformation, when King Christian III (1534–1559) decided that the church should function as a parish church, while the other priory buildings should be used as a hospital and poor house. In 1888 part of the former priory was converted into a chapel for the residents of the building, then as now principally the elderly.
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.