Leaning Tower of Pisa, Italy

One of the major tourist attractions in Italy, the noteworthy monument was finished in 1399. The original height of the tower is 60 metres and the side tilted is around 56 metres. As the name suggests the tower “leans” due to sandy, soft and unstable soil. To balance out the angle, the constructors managed to build extra columns and fill in extra soil on the side leaning, but nothing could help this iconic structure get back straight again. This feature makes the building an eye-catchy and influential structure in the history of architecture.