Castelo de Guimarães is a historic castle located in Guimarães, Portugal. Built in the 10th century, it played a crucial role in the formation of the Portuguese nation. The castle features impressive stone walls and towers, showcasing medieval military architecture. The site is recognized as a UNESCO World Heritage Site, reflecting its cultural significance. Visitors can explore the castle's grounds, which offer stunning views of the surrounding area. The castle is often associated with Afonso I, the first king of Portugal, who is believed to have been born in Guimarães.