The remains of the Castle can be visited
Gurre Castle

In northern Zealand, Denmark, near Helsingør, lies the Gurre Castle ruin, once a royal complex. Its history is closely linked to Danish kings and a tragic legend that continues to resonate in art and music today.
History+
The origins of Gurre Castle date back to the 12th century. In the mid-14th century, around 1350, the complex was expanded, receiving four towers and a perimeter wall. Its first documented mention appears in 1364, when Pope Urban V sent relics for the castle chapel. The castle is inextricably linked to King Valdemar IV Atterdag, who died here in 1375.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=1461
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 56.0195, 12.5053