Situated in the middle of a lake, the impressive Frederiksborg Palace hosts the Museum of National History. The museum has existed on the site since 1878, but the castle itself was constructed during the early part of the 17th century. At that time, it was the home of King Christian IV, one of Denmark’s most well-known monarchs. Visitors can roam the halls of the castle and view the vast collection of artwork. The gardens are not to be missed. Particularly of note are the gardens that lie on the far side of a lake, which can be crossed by boat. Some of the best castle views can be had from this vantage point.