This small church on Rüütli street has been the spiritual home for generations of Estonian Swedes, an ethnic group that's been present in Tallinn since the Middle Ages. The location had originally been an almshouse for the city's poor, but in 1733 the tsarist government gave it to the Swedish congregation, which been left without its own church since the Great Northern War.
During Soviet times the building was converted into a sports hall and fell into disrepair, but was renovated and reconsecrated in 2002. It now has a congregation of around 200, and continues to hold services in Swedish. In addition to its Baroque altar by Joachim Armbrust and a Baroque pulpit, the church has a unique baptistery created by famed sculptor Christian Ackermann in 1680.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.