Folketinget is the name of Denmark's parliament, which is located in a historical setting at Christiansborg Palace, often just called Borgen (the castle in Danish), on the island of Slotsholmen in Copenhagen.
The Danish parliament has always been surrounded by mystery and conspiracy theories. Many films such as the Danish Kongekabale (King's Game), and Danish TV series such as The Killing and Borgen have played out in the corridors of Christiansborg.