Guaita Castle is one of the three towers located on the summit of Mount Titano in San Marino. Built in the 11th century, it served as a fortress to protect the small republic from invasions. The castle features a cylindrical tower and offers stunning views of the surrounding landscape. Visitors can explore the castle's stone walls and enjoy panoramic vistas of the Emilia-Romagna region. Guaita is a popular tourist attraction, showcasing the rich history and architecture of San Marino. It is often depicted in photographs and postcards, symbolizing the country's heritage.