The Naantali Church was originally part of the Catholic Convent of St. Bridget. The convent was built between years 1443 and 1462 and church probably later in the end of 15th century. Nowadays the church is the only remaining building of the convent, which was closed during Reformation in 1540s. Naantali Church is damaged several times by fire and the present interior is mostly from the modern times except the pulpit (1622) and artefacts. There are lot of medieval items in church, for example crucifix from the monastery, wooden statues and magnificent altarpiece.
The church is situated in the old town of Naantali, which is mostly built in the 18th and 19th centuries. Finnish National Board of Antiquities has named the church and old town area as national built heritage.
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.