Pisa Tower vs Jeddah Tower

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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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Jeddah Tower (Arabic: ??? ????), previously called Kingdom Tower (??? ???????), is a stalled construction project of a skyscraper on the north of Jeddah, Saudi Arabia. It is supposed to be the world's first 1 km (3,281 feet ) high building, and the centrepiece and first phase of a development and tourist attraction called Jeddah Economic City.There was steady progress but in January 2018 building owner JEC halted structural concrete work together with the tower about one-third completed because of labour issues with a builder after the 2017--19 Saudi Arabian purge. JEC has said they plan to restart construction in 2020. The design, created by American architect Adrian Smith, who also designed the Burj Khalifa, incorporates many unique structural and aesthetic features. The founder and leader of the project is Saudi Arabian prince Al-Waleed bin Talal, a grandson of Ibn Saud, and nephew of the Kings of Saudi Arabia before him. Al-Waleed is the chairman of Kingdom Holding Company (KHC), which is a partner in the Jeddah Economic Company (JEC), which was formed in 2009 for the development of Jeddah Tower and City.

Source: Wikipedia