6. The Leaning Tower Of Pisa
While many people joke about the Leaning Tower of Pisa falling, it is billed as one of the eighth wonders of the world because of its structure. While the tower didn’t always lean, it now leans at about a four-degree angle because of the unstable foundation.
The tower took about 20 years to build, which started in 1173. Before the completion of the tower, people began to notice the building slightly leaned. Though the building’s lean hasn’t changed in years, experts state it can resume leaning at any time.
