The Hôtel de Ville is the city hall of Lyon and one of the largest historic buildings in the city. In the 17th century, Lyon was developed and the Presqu'île became the city center with the place of Terreaux, and the Lyon City Hall was built between 1645 and 1651 by Simon Maupin.
Following a fire in 1674, the building was restored and modified, including its facade, designed by Jules Hardouin-Mansart and his pupil Robert de Cotte. In 1792 during the French Revolution, the half-relief of Louis XIV on horseback, in the middle of the facade was removed and replaced only during the Restoration by Henry IV of France, in the same posture.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.