Start your week-long trip to Montjuïc by visiting the iconic Montjuïc Castle. Perched on top of the hill, this historic fortress offers breathtaking views of Barcelona. Take a leisurely stroll through the castle grounds, learn about its fascinating history, and enjoy the panoramic vistas of the city and the Mediterranean Sea. Don't forget to explore the castle's museum, which showcases various exhibits related to Barcelona's past. Afterward, you can relax in the nearby gardens and soak in the tranquil atmosphere.