The medieval Archbishop's Palace (Erkebispegården) is not only the oldest building of its kind in Scandinavia, it's also one of the best preserved such palaces in Europe.
Dating back to the late 12th century, the palace's west wing now houses a number of historic displays, including the Norwegian Crown Regalia exhibit - a spectacular collection of Norway's dazzling crown jewels - as well as the Army and Resistance Museums, with their focus on Trondheim's military history from Viking times to World War II.
Over in the south wing, the Archbishop's Palace Museum includes original sculptures and archaeological finds from nearby Nidaros Cathedral.