Castell de Montjuïc is a historic fortress located on Montjuïc Hill in Barcelona, Spain. Built in the 17th century, it was originally designed for military defense and has played a significant role in the city's history. The castle offers panoramic views of Barcelona and the Mediterranean Sea, making it a popular tourist attraction. Today, Castell de Montjuïc serves as a museum and cultural site, showcasing exhibitions related to its history and the surrounding area. Visitors can explore its well-preserved walls, gardens, and various military artifacts, providing insight into the fortress's past and its importance to the region.