Former trading post of the Hanse, Kalmar is famous for its medieval castle, where in 1397 the Union between the crowns of Sweden, Denmark and Norway was signed, to combat the powerful Hanseatic League. Located directly at the entrance to the port, this fortress surrounded by water, whose square tower dates from the 12th century, was then transformed into a Renaissance palace. You can discover the baroque historical centre of the town and the charming narrow streets and colourful wooden houses of the Gamla Stan district. Opposite, the great island of Öland protects the city from attacks from the Baltic Sea. This lush green island with its huge beaches is one of the favourite summer destinations of Swedes.