Start your day trip to Montjuïc by visiting the iconic Montjuïc Castle. Perched on top of the hill, this historic fortress offers breathtaking views of Barcelona and the Mediterranean Sea. Explore the castle's fascinating history, which dates back to the 17th century, and learn about its role in various conflicts. Take a leisurely stroll around the castle grounds and enjoy the panoramic vistas before moving on to the next attraction.