A piece of cast bearing his name was discovered at the foot of the tower in 1820, but this may be related to the bronze door in the façade of the cathedral that was destroyed in 1595. Pisano left Pisa in 1185 for Monreale, Sicily, only to come back and die in his home town. For many years, the design was attributed to Guglielmo and Bonanno Pisano, a well-known 12th-century resident artist of Pisa, known for his bronze casting, particularly in the Pisa Duomo. There has been controversy about the real identity of the architect of the Leaning Tower of Pisa.
The structure was stabilized by remedial work between 19, which reduced the tilt to 3.97 degrees. By 1990, the tilt had reached 5.5 degrees. The tower began to lean during construction in the 12th century, due to soft ground which could not properly support the structure's weight, and it worsened through the completion of construction in the 14th century. The tower has 296 or 294 steps the seventh floor has two fewer steps on the north-facing staircase. Its weight is estimated at 14,500 tonnes (16,000 short tons). The width of the walls at the base is 2.44 m (8 ft 0 in). The height of the tower is 55.86 metres (183 feet 3 inches) from the ground on the low side and 56.67 m (185 ft 11 in) on the high side. The tower is situated behind the Pisa Cathedral and is the third-oldest structure in the city's Cathedral Square (Piazza del Duomo), after the cathedral and the Pisa Baptistry. The Leaning Tower of Pisa (Italian: torre pendente di Pisa), or simply the Tower of Pisa (torre di Pisa ), is the campanile, or freestanding bell tower, of the cathedral of the Italian city of Pisa, known worldwide for its nearly four-degree lean, the result of an unstable foundation.
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