Kronborg Castle, Helsingør
The castle is situated on the extreme northeastern tip of the island of Zealand at the narrowest point of the Øresund, the sound between Denmark and Sweden. In this part, the sound is only 4 kilometres (2.5 mi) wide, hence the strategic importance of maintaining a coastal fortification at this location commanding one of the few outlets of the Baltic Sea.
The castle's story dates back to a stronghold, Krogen, built by King Eric VII in the 1420s.
This is a UNESCO World Heritage Site.