Frederiksborg Castle is a former royal residence, from the time when the kingdom was ruled by Frederick II. The castle was built on three islets in Lake Slotssøen. Today's castle is a result of the reconstruction in 1882 since the previous castle burned down in 1859. The building was given the purpose of the Museum of National History. Visitors especially emphasize the beauty of the Chapel, the Great Hall, the court parks, and the Neptune fountain.