Nyköping Castle is a historic fortress located in Nyköping, Sweden. Built in the late 13th century, it served as a royal residence and played a significant role in Swedish history. The castle features a mix of architectural styles, reflecting its long history and various renovations over the centuries. Today, Nyköping Castle is a popular tourist attraction, offering guided tours that showcase its rich heritage. Visitors can explore the castle grounds, learn about its historical significance, and enjoy beautiful views of the surrounding area, including the nearby Nyköping River.