Tower of Pisa is one of the seven wonders of the world which was built in 1178. Construction is tilted but still standing strong despite more than eight centuries stood with unusual conditions make the bell tower at the peak of this special. When someone asks, "Is the tower that this slope is increasing each year could collapse?" The answer is "Yes." Tower of Pisa had almost collapsed on January 7th, 1990. The management decided to close the tower of Pisa to the public because the slope of the towers are already in the alarming level and is predicted to be felled at any time.
Intensive reconstruction was performed immediately after preserving historic monuments that are part of this cathedral in Pisa. All the residents who live around the tower were evacuated to prevent the fall, the bell at the top of the tower was temporarily moved to reduce the burden of the tower. Steel wires were used to maintain the stability of the tower. Reconstruction focused on the overhaul of the foundation that has become a major problem. Finally after a period of intensive reconstruction, the Tower of Pisa reopened to the public on December 15, 2001. In May 2008, the engineers ensure that conditions of the Tower of Pisa will be safe (not the slope increases) at least for 300 years.
History of the Tower of Pisa itself is actually quite unique. The tower was built in four stages and it took two centuries. The slope is the main attraction is actually a calculation error, because the foundation is too small and the tower was built on sandy soil. So that when the construction reaches the 3rd floor partially collapsed towers and towers to be tilted. After having been suspended for 100 years, eventually building the Tower of Pisa was continued by adding four more floors, built in the direction "toward the perpendicular" to compensate for the slope. So actually the Tower of Pisa is not only crooked, but also curved.
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