A palatial complex in Hillerød, built as a royal residence for King Christian IV of Denmark-Norway in the early 17th century, replacing an older castle acquired by Frederick II and becoming the largest Renaissance residence in Scandinavia. Situated on three islets in the Slotssøen, it is adjoined by a large formal garden in the Baroque style.

The Neptune Fountain was designed by Adrien de Vries, the Neptune fountain is considered to be the castle's sculptural masterpiece. It was created from 1620 to 1622 to stand on the castle's forecourt symbolizing Denmark's position as a leading Nordic power in the early 17th century. The large bronze figures were cast in Prague where de Vries was employed as a sculptor by the imperial palace. Symbolizing the Danish king, the sea god Neptune is the central figure, while tritons piping their seashells decorate the outer basin. The current fountain is a copy of the original which was dismantled by the Swedish troops in 1659 and taken to Sweden for war reparations following the Treaty of Roskilde in 1658. The reassembled fountain now stands in the gardens of Drottningholm Palace outside Stockholm. The copy was made by Heinrich Hansen in 1888 with funding from J.C. Jacobsen.