When it comes to the expansion area of Barcelona, people often wonder and lament that it should be the most regulated neighborhood in the world. Yes, the emergence of the expansion area of Barcelona is undoubtedly not a miracle in the construction of the world's cities. The establishment of the expansion area is the shouting and counterattack of the people of Barcelona to the continent. It is a gathering place for businessmen, celebrities, and dignitaries, and is the heart of Barcelona.