Pisa Tower vs Berlin Cathedral

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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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The Berlin Cathedral (German: Berliner Dom) is a Protestant church and dynastic tomb on the Museum Island in Berlin.

Built from 1894 to 1905 by order of German Emperor William II according to plans from Julius Raschdorff in Renaissance and Baroque Revival styles, the listed building is the largest Protestant church in Germany and one of the main dynastic tombs in Europe. In addition to church services, the cathedral is utilized for state ceremonies, concerts and other occasions. Since the demolition of the Memorial Church (Denkmalskirche) on the north side by the East German government in 1975, the Berlin Cathedral has consisted of the large Sermon Church (Predigtkirche) in the center, the smaller Baptismal and Matrimonial Church (Tauf- und Traukirche) on the south side and the Hohenzollern crypt (Hohenzollerngruft), which covers almost the entire basement. Damaged during the Allied bombing in World War II, the cathedral's original interior was restored by 2002. Currently there is discussion about restoring the historic exterior too.

Source: Wikipedia