The Kärnan is all that remains of the original Helsingborg Castle that was built by King Eric VI of Denmark at the start of the 14th century. The fortress held a strategic position to protect the narrow strait of the Øresund sound. The citadel exchanged hands several times between Denmark and Sweden until most of the castle was demolished during the late 17th century. Yet this 115 foot tower has stood proudly for over 700 years.