There are plenty of interesting historic sights around Copenhagen for a day trip, like the outstanding Renaissance style Kronborg Castle. Please note it's also easy to visit in Malmö, Sweden over the Øresund Bridge which is the longest combined road and rail bridge in Europe.
At the heart of Malmö lies the Big Square (Stortorget). There is a statue of King Karl X Gustav of Sweden, who took the city from Danish dominion. The ornate Malmö City Hall (built in 1546) is on the east side, and in the northwest corner is Kockska Huset, the house of Jörgen Kock, a German immigrant who became mayor of the city and achieved wealth simply and directly: by taking control of the city mint. In the winter the square becomes a skating rink.
Carlsberg center is located in Valby at the location of the first Carlsberg Brewery. The visitor centre will give you an idea of how the world-famous Carlsberg Beer is made. Carlsberg is among the largest tourist attractions in Copenhagen. The Old Carlsberg Brewery from 1847 has been converted into a modern centre for visitors which exhibits the history of the beer.
Ogrodzieniec Castle is a ruined medieval castle originally built in the 14th–15th century by the W³odkowie Sulimczycy family. Established in the early 12th century, during the reign of Boles³aw III Wrymouth, the first stronghold was razed by the Tatars in 1241. In the mid-14th century a new gothic castle was built here to accommodate the Sulimczycy family. Surrounded by three high rocks, the castle was well integrated into the area. The defensive walls were built to close the circuit formed by the rocks, and a narrow opening between two of the rocks served as an entrance.
In 1470 the castle and lands were bought by the wealthy Cracovian townsmen, Ibram and Piotr Salomon. Then, Ogrodzieniec became the property of Jan Feliks Rzeszowski, the rector of Przemy¶l and the canon of Cracow. The owners of the castle about that time were also Jan and Andrzej Rzeszowskis, and later Pilecki and Che³miñski families. In 1523 the castle was bought by Jan Boner.