Precariously Leaning Towers of the World

Many people are familiar with the Leaning Tower of Pisa, one of the most famous buildings in the world. Construction began on the Tower in 1173 and took place in three stages over 177 years but the structure had already begun to sink into the unstable soil by 1178. Before restoration work took place between 1990 and 2001, the tower leaned at an angle of 5.5 degrees, but this has now been reduced to just under 4 degrees:

Full post: Precariously Leaning Towers of the World