After remaining steady for almost 1,000 years, the Garisenda tower – also known as the 'leaning tower' - in Bologna town of Italy now faces the risk of collapsing due to excessive leaning. A metal cordon has been being built around the tower to stop the spread of debris and decrease the vulnerability of buildings around it. Since the 14th Century, the 150-foot tall tower has continued to lean at an angle of 4 degrees. The iconic Tower of Pisa has been leaning at 5 degrees. The tower is at risk of a sudden and unexpected collapse.