The belfry of Namur, also called Saint-Jacob's Tower was constructed in 1388 as part of the city wall. It was remodeled as a belfry in 1746. It is one of the 56 belfries of Belgium and France classified as the World Heritage Site of the UNESCO.
In the beginning, one of the clocks of the Saint-Pierre-au-Château church served as belfry for the citizens of Namur, which is to indicate the time and to announce events in the city. After the destruction of the church, burned down during the siege of Namur in 1745, the Tour Saint-Jacques, the oldest of the three towers of the medieval city walls, became the city belfry. The Tour Saint-Jacques protected one of the city gates. Its bancloque (belfry clock) gave the signal for the opening and closure of the external city gates (from 1570 on).
At the beginning of the 18th century, the city wall was demolished but the Tour Saint-Jacques was preserved, restored and its clock was covered by an octagonal structure. This entire part was lifted upon a clock bulb. The Tour Saint-Jacques became Namur's city belfry in 1746.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.