The picture taken on May 30, 2013 shows the Altar of the Fatherland in Rome, Italy. Rome has been listed as the most visited Italian city in the first six months of the year according to the index by Hotels.com, followed by Venice, Milan, Florence and Sorrento.(Xinhua/Xu Nizhi)

The picture taken on May 30, 2013 shows the view of Rome in Italy. Rome has been listed as the most visited Italian city in the first six months of the year according to the index by Hotels.com, followed by Venice, Milan, Florence and Sorrento.(Xinhua/Xu Nizhi)

The picture taken on May 19, 2014 shows the Bay of Naples in Italy. Rome has been listed as the most visited Italian city in the first six months of the year according to the index by Hotels.com, followed by Venice, Milan, Florence and Sorrento.(Xinhua/Xu Nizhi)

The picture taken on May 26, 2013 shows the view of Florence in Italy. Rome has been listed as the most visited Italian city in the first six months of the year according to the index by Hotels.com, followed by Venice, Milan, Florence and Sorrento.(Xinhua/Xu Nizhi)

The picture taken on May 30, 2013 shows the Colosseum in Rome, Italy. Rome has been listed as the most visited Italian city in the first six months of the year according to the index by Hotels.com, followed by Venice, Milan, Florence and Sorrento.(Xinhua/Xu Nizhi)