Leaning Tower of Pisa. High marble tower is 54 meters (181 feet) with 8 floors, each floor has marble engraved. The act created on 1717 (AD 1174) was completed in the year 1893 (AD1350) takes up to 176 years to create a building that takes the longest in the world. Another is when the miracle began to build 4-5 storey tower began to tilt. But not to the collapses. Because the center of gravityWhen completed Top of the tower is tilted away from the vertical to 4 meters (14 feet).