 Other than the UEFA Champions League Final, it is considered one of the biggest club football games in the world, and is among the most viewed annual sporting events.A fixture known for its intensity, it has featured memorable goal celebrations from both teams, often involving mocking the opposition.The rivalry comes about as Madrid and Barcelona are the two largest cities in Spain, and they are sometimes identified with opposing political positions, with Real Madrid viewed as representing Spanish nationalism and Barcelona viewed as representing Catalan nationalism.