Guimarães Castle is a historic fortress located in Guimarães, Portugal. Built in the 10th century, it played a crucial role in the formation of the Portuguese nation. The castle features robust stone walls and towers, showcasing Romanesque architectural style. The site is often associated with Afonso I, the first King of Portugal, who is believed to have been born in the nearby Palace of the Dukes of Braganza. Today, Guimarães Castle is a popular tourist attraction, offering visitors a glimpse into Portugal's medieval past and stunning views of the surrounding landscape.