Leaning Tower of Pisa

The restoration work took twenty years and in April 2011, the tower was opened to the public.

An excerpt from the article 20 facts about Leaning Tower of Pisa
The restoration work was carried out by a team of experts led by Michele Jemiolkowski, professor of geotechnics at the Polytechnic University of Turin. They applied the method of reinforcing the foundation and preventing further tilting. The Leaning Tower of Pisa is guaranteed by the scientists to last for at least 300 years.