The Aman Canal Grande opened in June in San Polo, the smallest of Venice’s six districts and one of the oldest, dating back to the ninth century. Housed in a 16th-century palazzo overlooking the Grand Canal, the 24-room hotel is steeped in history, with many rooms featuring protected frescoes and reliefs. Its Garden Terrace is one of the few private gardens on the Grand Canal, and it offers summertime alfresco Japanese-French dining. The hotel has a roof terrace, a spa and gym, a bar, a library, and a dining r…