Barcelona, Spain (14/20)

Barcelona’s streets are alive with color, thanks to the influence of Modernist architecture. Antoni Gaudí’s masterpieces, such as the whimsical Park Güell and the breathtaking Sagrada Familia, are known for their vibrant mosaics and organic shapes. The city’s lively neighborhoods, especially El Raval and El Born, are filled with colorful street art, making it one of the most dynamic cities in Europe.