In the South of Denmark, on a small island off Jutland in Sonderborg sønderborg castle. The founder of the castle in 1158 was king Valdemar the Great, great-grandson of the Kiev Prince Vladimir Monomakh. Among the famous castles of Denmark this is a special place. Impregnable fortress Sønderborg differs significantly from the finest residences of kings. The main strategic purpose of the lock - protection of the Baltic coast from the raids of the Slavonic tribes of the wends.

In the XIV century the castle was greatly enlarged, there appeared the massive walls, was constructed Blue tower. In 1490 the castle became the property of king Hans. King Hans and his son Christian II made every effort to build the strong and impregnable fortress in the country. In 1523 Christian II was deposed from the throne and spent 17 years in custody in the Blue tower, but in appropriate Royal person conditions.

With 1549-1557, a famous architect Hercules von Oberberg has reconstructed the fortress and three wings were added in the Renaissance style. The same architect in 1568 the chapel was built in sønderborg castle referred to Queen Dorothea. With 1718-1726, by decree of king Frederik IV, the castle was rebuilt in Baroque style by the famous architect Wilhelm von Platinum. In 1755 demolished the Blue tower.

From 1921 to the present day in sønderborg castle is a Museum that displays a variety of exhibits, ranging from the middle ages to our time. Special attention of tourists is the exhibition devoted to the wars of the XIX century, the First and the Second world war. Also in the castle viewed an exhibition of paintings by masters of Jutland.