Rosenborg Castle, built by Christian IV in the early 17th century, provides families with a beautiful view while sitting or strolling through the King’s Garden in the city center. Explore around Knights’ Hall, marvel over Denmark’s crown jewels, or take in the beauty of Queen Caroline Mathilde’s portrait. Admission is free for those under the ages of 18, 60 Danish Kroner for students, and 90 Danish Kroner for adults. Hours vary by season.