Leaning Tower of Pisa

The entire historical complex, consisting of four masterpieces of medieval architecture, was inscribed on the UNESCO World Heritage List in 1987.

An excerpt from the article 20 facts about Leaning Tower of Pisa
In 1063, Buscheto Pisano began constructing the cathedral - the first of the four buildings that form the city's architectural center. These buildings were built according to the best interpretation of Pisan Romanism. 

The Pisan Romanesque style was created by combining Eastern architectural and decorative elements with Western architectural elements (pointed arcades, decoration with white and black stripes, pilasters and rhombuses ), which brought a taste of the journey to the East on Pisan Romanesque.