Barcelona is a Spanish city located in Catalonia. The author chose Barcelona because he is devoted to its organized street patterns and commitment to reducing pollution through bike lanes and renewable energies. Some of the most interesting places to visit in Barcelona include Antoni Gaudi's unfinished Sagrada Familia basilica, Gaudi's Park Güell with its gardens and architecture, and the Gothic neighborhood with its captivating streets. The FC Barcelona stadium and museum and Barceloneta beach are also recommended places to relax after touring the city's museums and monuments.