One of the most outstanding architectural structures of medieval Europe (partly due to human error during construction), the Leaning Tower is today the most famous landmark of Pisa. It is the bell tower of the Cathedral whose construction began in 1173, and continued for over two centuries. This miscalculated eight-story building is over 55 metres high and leans at an angle of 5 degrees. Without any doubts, this popular tourist attraction is a "must" when visiting the city. Don’t forget the camera, since this is a perfect place to take some amusing photos.