Hartenfels Castle is a historic fortress located in Torgau, Germany. Built in the 15th century, it is one of the earliest examples of Renaissance architecture in the country. The castle served as a residence for the Electors of Saxony and played a significant role in the Reformation. The castle features impressive structures, including the St. Mary's Church and the Great Hall, showcasing beautiful frescoes and intricate designs. Today, Hartenfels Castle is a popular tourist destination, offering visitors a glimpse into its rich history and architectural significance.