Copenhagen: Rosenborg Castle.

“The castle is open to the public for tours and houses a museum exhibiting the Royal Collections, artifacts spanning a breadth of royal Danish culture, from the late 16th century of Christian IV to the 19th century. Some of these articles once belonged to the nobility and the aristocracy. The castle, now state property, was opened to the public in 1838.”

Bottom left: Crown of King Christian IV. “Christian IV (Danish: Christian den Fjerde; 12 April 1577 – 28 February 1648), sometimes colloquially referred to as Christian Firtal in Denmark and Christian Kvart or Quart in Norway, was a monarch of the German House of Oldenburg who ruled as king of Denmark-Norway from 1588 to 1648. His reign of 59 years is the longest of all Danish monarchs, and the longest of all the Scandinavian monarchies.”