Pisa Tower vs Northeast Asia Trade 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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<p>The Posco Tower-Songdo or Northeast Asia Trade Tower (Korean: ?????-??) is a skyscraper at Songdo International City, the world's most expensive private real estate project in the Incheon Free Economic Zone, South Korea. </p>The 305-metre (1,001 feet ) building is now South Korea's fourth tallest, and has 68 flooring. It surpassed the previous record-holder, Samsung Tower Palace 3 -- Tower G in Seoul, when it. Although completed in 2011, the completion of its interior was postponed due to financial complications during a recession.The construction was intended to be a landmark of the Songdo International Business District that was assembled on unused land along the waterfront near Incheon. It includes 19 floors of class A office space, South Korea's tallest observatory on a luxury resort, the 65th-floor residences, and retail shops. The column-free flooring include an office lobby at ground level with Vermont slate stone walls and French limestone flooring.

Source: Wikipedia