Palau de la Música Catalana was mentioned a number of times on Tripadvisor as being one of the most beautiful buildings in Barcelona. It was built between 1905 and 1908 by the architect Lluís Domènech i Montaner. The style is Art Nouveau and is considered as World Heritage Site. We took a guided tour and it was very informative. Once inside you are in for a treat for your senses.