Pisa Tower vs Ponte City Apartments

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The Leaning Tower of Pisa (Italian: Torre pendente di Pisa) or simply the Tower of Pisa (Torre di Pisa [?torre di ?pi?za]) is the campanile, or freestanding bell tower, of the cathedral of this Italian city of Pisa, known globally for its almost four-degree lean, the result of an unstable foundation. The tower is situated behind the Pisa Cathedral and is the third-oldest structure in the city's Cathedral Square (Piazza del Duomo), following the palace and the Pisa Baptistry. The height of this tower is 55.86 metres (183.27 feet) from the ground on the low side and 56.67 metres (185.93 feet) on the high side.

The width of the walls at the base is 2.44 m (8 feet 0.06 in). Its weight is estimated at 14,500 metric tons (16,000 short tons). The tower has 296 or 294 steps; the seventh floor has two fewer steps on the north-facing staircase. 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 building in the 14th century. By 1990, the tilt had reached 5.5 degrees. The structure was stabilized by remedial work between 1993 and 2001, which decreased the tilt to 3.97 degrees.

Source: Wikipedia

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Ponte City is a skyscraper at the Berea Area of Johannesburg, South Africa, just next to Hillbrow.

It was developed in 1975 to a height of 173 m (567.6 ft), which makes it the tallest residential skyscraper in Africa. The 55-story building is cylindrical, with an open centre allowing additional light to the apartments. The centre space is known as'the core' and rises above an uneven rock floor. When built, Ponte City was seen as an extremely desirable address due to its views over all of Johannesburg and its environment. The neon sign on top of the building is the largest sign from the southern hemisphere and advertised for the Coca-Cola Company prior to 2000. It now advertises the South African mobile phone company Vodacom.

Source: Wikipedia