1. The National History Museum in Copenhagen, also known as Frederiksborg Slot, is located in a stunning Renaissance castle that was built during the reign of King Christian IV in the early 17th century. The museum houses an impressive collection of Danish art and portraits from the 16th to the 20th centuries, as well as exhibits on the history of Denmark from the middle ages to modern times. Visitors can explore the opulent rooms of the castle, including the Great Hall, Chapel, and Knight’s Hall, which is home to over 1000 years of Danish history depicted in 78 grand portraits. One interesting fact about the castle is that it was used as a filming location for the movie \"Hamlet\" starring Kenneth Branagh.

2. The National History Museum is open daily from 10am-5pm, and can be contacted by phone at +45 48 24 09 78.

3. Tickets can be purchased at the museum or online in advance, with prices ranging from 75-130 DKK depending on age and whether or not you want to visit the special exhibitions. The museum is located in Hillerød, about 30 minutes by train from Copenhagen. From the Hillerød train station, it’s a short walk or bus ride to the castle.