Zifeng Tower vs Cairo Tower

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Zifeng Tower (Greenland Center-Zifeng Tower or Greenland Square Zifeng Tower, previously Nanjing Greenland Financial Center) is a 450-meter (1,480 feet ) supertall skyscraper (special class of skyscraper) in Nanjing, Jiangsu. The 89-story building finished in 2010 includes office and retail space up to floor 41. Floors 49-71 feature a hotel, a lot of restaurants, and a public observatory on the 72 floor. The tower's stepping is practical, helping to separate those sections.

The building is currently the tallest in Nanjing and Jiangsu province, the eleventh tallest in China and the twentieth tallest on earth. Architectural firm Skidmore, Owings and Merrill designed the building, headed by Adrian Smith. The Tower occupies an area of 18,721 square meters. The Nanjing Greenland InterContinental Hotel is located within the tower.

Source: Wikipedia

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The Cairo Tower (Egyptian Arabic: ??? ???????, Borg El-Q?hira) is a free-standing cement tower in Cairo, Egypt. In 187 m (614 ft), it has been the tallest structure in Egypt and North Africa for approximately 50 years. It was the tallest structure in Africa for ten years before 1971, when it was surpassed by Hillbrow Tower in South Africa. One of Cairo's famous modern monuments, sometimes considered Egypt's second most famous landmark following the Pyramids of Giza, it stands in the Gezira district on Gezira Island in the River Nile, near downtown Cairo.

Source: Wikipedia