Barcelona Must See Sites & travel tips. Barcelona, Spain's second-largest city, is inextricably linked to the architecture of Antoni Gaudi. His most famous and unfinished masterpiece, La Sagrada Familia, is the emblem of the city, but there is so much more to Barcelona. We share travel tips and top attractions when visiting Barcelona. #barcelonatraveltips
Casa Batllo (World Heritage Site) - One of 2 houses by Gaudí in Barcelona that can be toured. truly amazing and worth the visit. go in the mornings, before the site gets crowded with architecture students.