Erkebispegården is the oldest secular building in Scandinavia, dating from around 1160. It was the residence of the archbishop until the Reformation in 1537. The Archbishop's Palace Museum has original sculptures from Nidaros Cathedral and archaeological pieces from throughout its history. Within Erkebispegården's inner palace is the Rustkammeret/Resistance Museum, which traces military development from Viking times to the present through displays of uniforms, swords, and daggers. The dramatic events of World War II get a special emphasis. Opening times for the various museums and wings in the Erkebispegården and for the cathedral vary greatly by season.