Bjørn Nørgaard's 17 tapestries recounting the history of Denmark were hung on the walls. The tapestries were a gift from the Danish business community on the occasion of Queen Margrethe II's 50th birthday. The Alexander Hall (Alexandersalen) is named for Bertel Thorvaldsen's marble frieze "Alexander the Great Enters Babylon". The frieze was made for the second Christiansborg Palace, and parts of it survived the fire. It was later restored and mounted in this room. The Hall is used for smaller receptions and official dinners, often in connection with state visits. Parliament Wing The first floor of the Parliament Wing is structured around the Lobby. At both ends of Lobby are the chambers of Rigsdagen, the former bicameral parliament; the Folketing chamber is located at the far end and the Landsting located at the other (the far chamber has been the only one in use since the Folketing became the sole legislative assembly in 1953). Along the hall are various rooms such as the Speaker's office and offices for the administration. Ruins under the palace Under the present palace lie the ruins of Bishop Absalon's Castle and Copenhagen Castle. When the foundations of the present Christiansborg Palace were being cast, workers came across ruins of several buildings and parts of a curtain wall. Experts were called in from the National Museum of Denmark and the ruins, which lay beneath the inner palace yard, were unearthed. Public interest in these ruins, which dated back to around the year 1167, was tremendous. It was therefore decided that the ruins should not be covered over again but preserved for posterity. The reinforced concrete structure erected to cover the ruins was the biggest of its kind in Denmark when it was built in 1908. The ruins beneath the palace square were excavated in 1917 and a cover was also built over them. The ruins have been open to the public since 1924. The Ruins Exhibition was renovated during the period 1974-77 and has remained more or less untouched since then. The Palace Chapel Christiansborg Palace Chapel is a part of the palace which is at the disposal of the Danish monarch. It is used for religious ceremonies for members of the Danish royal family, most notably baptisms, confirmations and official lying in state. It is also used by the Danish Parliament for the Church service in connection with the opening of parliament. The history of