The well-known Tower of Pisa, in Italy, is the bell tower of the cathedral of Pisa. This construction became famous for a very particular cause and is that it has about 4 degrees of inclination with respect to the vertical.
The tower was not built intentionally inclined. At the beginning of its construction the plan was to build the bell tower like any other, perfectly vertical, but years later one of its sides began to sink due to the weakness of the terrain.
Different construction errors were made in the tower that caused its particular inclination, but something that was taken special care was in the beautiful artistic details that decorate it.
A curious fact well known is the famous experiment that supposedly Galileo Galilei made from its top, throwing two objects of different mass from the top of the tower and verifying that they took the same time to fall, showing that the acceleration of gravity does not depend on the mass . Although in reality there is no evidence of this, but the experiment does work.