Castello is the largest district in the city, which contains the island of San Pietro di Castello, connected to the city with a long bridge, which used to be a nucleus of religion in the past. The most historical cathedral of Venice is located in this area. Arsenale, the ages old shipyard (which boasts of a wonderful access portal encircled by two enormous lions) of the Serenissima is also located within this district.Every year, the city's water levels increase. The muggy summer air cooks the canals and scores the paint and enameled from the city's greatest pieces of art. Faithful to its origins, everything in Venice seems to be in peril. This has - logically - spiked tourism in Venice, which for years has been the single means of support for the historic city, so at least you can rest confident that the high prices you"ll encounter will be funneled into programs to modernize the city.