The Leaning Tower of Pisa et al.

The leaning tower of Pisa, is Pisa's famous bell tower. It is known for its nearly four-degree lean, the result of an unstable foundation. The tower is one of three structures in the Pisa's Cathedral Square (Piazza del Duomo), which includes the cathedral and Pisa Baptistry.

In 1993, a repair effort occurred as reports were that the tower was in danger of breaking. In 2018, after self correcting for more than a decade the tower had finally stopped and gained 4 cm back in the "straight" direction.

You can read more about that here.
https://www.scientificamerican.com/article/lean…Lue lisää