So, finally I got to see the famous leaning tower, one of the most unique in the world because of its leaning position. As you can see, the tower is not the only attraction in Piazza del Duomo. There is the Bapristery and the Duomo (cathedral).
The Baptistery (Battistero) looks like a Romanesque crown.
The cathedral was designed by Buschetto in 1063.
See the gold ceiling of the cathedral? According to the tour guide, these are real gold bars