The Roman amphitheatre in Brescia is located immediately at east of the Capitolium. It has been built in the Flavian era and altered in the 3rd century. With its 86 meters diameter, is one of the largest Roman theatres in northern Italy and originally it housed around 15,000 spectators.
In the 5th century, an earthquake has heavily damaged the building. In addition, in later centuries, its remains were incorporated into new buildings built on top of it, largely demolished starting from the 19th century. Of the original structure are preserved the semicircular perimeter walls, the two side passages (aditus) and the remains of the proscenium, as well as many fragments of columns and friezes of the scaenae frons. The most of the orchestra and the ima cavea are still below ground. The archaeological excavations should resume in the coming years.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.