The park surrounding the Royal Palace (Slottet) is open to the public year-round. The changing of the guard, albeit a weak imitation of the changing of the guard at London's Buckingham Palace, takes place daily at 1:30pm. When the king is in residence, the Royal Guard band plays Monday to Friday during the ceremony. The palace was constructed from 1825 to 1848. Some first-time visitors are surprised at how relatively unguarded it is, without walls or rails. You can walk through the grounds but can't go inside unless you have an invitation from the king. The statue at the front of the castle (at the end of Karl Johans Gate) is of Karl XIV Johan himself, who ruled Norway and Sweden. He ordered the construction of this palace but died before it was finished. Allot about 20 minutes.