Kronborg Castle in Elsinore, at the seaward approach to The Sound Øresund, is one of northern Europe's most important Renaissance castles. Known all over the world from Shakespeare's Hamlet, it is also the most famous castle in Denmark and is visited each year by about 200,000 Danes and tourists.
Kronborg Castle was named after King Frederik II in 1577, but its history goes right back to the 1420s, when Erik of Pomerania built the strongly fortified castle known as "Krogen" ("The Hook"). From here the king’s men controlled the shipping in the Sound and collected the unpopular Sound Dues.
Reeference: http://www.ses.dk/395955f0/GSID/2061772