Listed as a UNESCO World Heritage site in 2000, Kronborg Castle stands as one of the most important castles in Europe. It is found in Helsingor and dates back to the early 1400’s. Originally built as a fortress to help protect the area from Baltic Sea invaders, the landmark is among the more phenomenal Renaissance-built structures in Denmark and is much-adored by tourists. The Danish were the last to use the castle as a stronghold in the 1920’s, with the government having later turned the site into a public attraction.