The Castello district is little visited by tourists and stands in an area between the north part of the lagoon and the Riva degli Schiavoni. Visit the arsenal where the large war-ships of the Venetian fleet were constructed. Walk along the gang-planks and boarding stations of the Riva degli Schiavoni, bustling with souvenir stalls, restaurants and cafes. This route leads to the Public Garden and has always been the most important promenade in Venice. Today it is a crowded crossroads of steam-ships and island cruisers. Beyond the market stores, the district is calm and characterised by narrow alley ways, elegant buildings and beautiful churches including the large Gothic Santi Giovanni e Paolo Church and the Pietà Church, whose choir master was Vivaldi and where every Tuesday and Thursday it is possible to admire both the music of Vivaldi and the Tiepolo frescoes.