The Lofotr Viking Museum is a historical museum based on a reconstruction and archaeological excavation of a Viking chieftain's village on the island of Vestvågøya. In 1983, archaeologists uncovered the Chieftain House at Borg, a large Viking Era building believed to have been already established around the year 500 AD. A joint Scandinavian research project was conducted at Borg from 1986 until 1989. Excavations revealed the largest building ever to be found from the Viking period in Norway. The foundation of the Chieftain House at Borg measured 83 metres long and 9 metres high. The seat at Borg is estimated to have been abandoned around AD 950.
After the excavation ended, the remains of what had once been the long-house remained visible. The long-house has been reconstructed slightly to the north of the excavation site. In 1995, the Lofotr Viking Museum was opened. The museum includes a full reconstruction of the 83-metre long chieftain's house, a blacksmith's forge, two ships (replicas of the Gokstad ship, one in full scale size) and their boathouses, and various reenactments intended to immerse the visitor in life at the time of the Vikings. The main building was designed by Norwegian architect, Gisle Jakhelln.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.