Barcelona is home to no less than nine monuments declared World Heritage Sites by UNESCO, making it one of the most heterogeneous cities in the world. These complex and unique works are symbols of a unique culture and heritage that must be protected. Seven of them are by the architect Antoni Gaudí, and all of them are witnesses of the natural spectacularity and the cultural imprint left in Barcelona by the art nouveau, modernism, typical of Catalonia. Have you seen them all? #patrimoniodelahuman