The leaning tower of pisa in Italy seems like a miracle that is defying gravity`s pull. Since gravity force would be greater on objects with greater mass, it is fascinating how pisa tower is still standing with an approximate mass of 14,500 tonnes! Physicists predict that the tower would fall when its leaning angle reaches 5.44 degrees, but the pisa tower has been seen to reach an angle of 5.5 degrees before restoration work has been done between 1990 and 2001. With advancing technology in engineering and architecture, the tower is now standing at an 3.99 degrees angle. This helps with preserving this amazing architecture piece for another few hundred years or even longer.