Quiet nook inside the city
In my opinion, Plaça del Rei is one of the loveliest in Barcelona because it preserved the old architectural style. While the rest of the Gothic Quarter has developed, houses have been built, new buildings, palaces of the renaissance period and even modernist buildings like the Modern Art Museum, Plaça del Rei is still the same.
In the back there is the Palacio Real Mayor you can visit as part of the premises of Plaça del Rei, with the Palatina chapel and the owner's palace, which used to contain the archives of the crown of Aragon.
In the Padellas palace, there is the city's museum of history.