Barcelona is home to some of the most graceful art nouveau buildings in Europe. Among the most famous ones are Sagrada Familia, Casa Batlló, and Parc Güell, all designed by the famous Catalonian architect Antoni Gaudí. The atmosphere of Barcelona is highly dictated by the immense color scheme of the buildings, which boast an overwhelming richness in details, patterns, and colors. Take a stroll through the small narrow alleys in the Gothic Quarter, and you will see how the sun rays and shades are sharing the limited space between the buildings.