Sightseeing tour of Barcelona by public transport

I offer to explore the main attractions of the city of Barcelona: the old city with the Cathedral, the Jewish quarter, the Royal Palace, the Church of Santa Maria, the Plaza of Catalonia, from which nine streets depart, the Boulevard of Gracia with the house of Mila and the house of Batllo, Sagrada Familia, Las Ramblas, Plaza de España, the Camp Nou stadium with the use of the metro, bus or taxi, so on personal experience appreciate the work of public transport and truly feel like a citizen of the county city.