However, during the construction of the first, just 5 years after start construction, it was found that the This tower began to lean down to the north.However, architect, Giovanni Di Simone, it continues to build on and the tower leaning down, expert says Because the ground is used in the construction quality.But with the materials used in construction, which is made from limestone and lime. It can bend and withstand any better than other materials. . like stone or brick. This is the reason why this tower will not collapse. But back then.Lie down gradually