Zifeng Tower vs Colosseum

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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 Colosseum ( KOL-?-SEE-?m), also known as the Flavian Amphitheatre (Latin: Amphitheatrum Flavium; Italian: Anfiteatro Flavio [a?fite?a?tro ?fla?vjo] or Colosseo [kolos?s??o]), is an oval amphitheatre in the middle of the city of Rome, Italy. Constructed of travertine limestone, tuff (volcanic rock), and brick-faced concrete, it was the largest amphitheatre ever constructed at the time and held 50,000 to 80,000 spectators. The Colosseum is just east of the Roman Forum. Construction started under the emperor Vespasian in AD 72 and was completed in AD 80 beneath his successor and heir, Titus. Further modifications were made during the reign of Domitian (81--96). These three emperors are known as the Flavian dynasty, and the amphitheatre was named in Latin because of its association with their family name (Flavius). The Colosseum could hold an estimated 50,000 to 80,000 spectators at various points of its history over the centuries, having a typical audience of some 65,000; it was used for gladiatorial contests and public spectacles such as mock sea battles (for only a short time as the hypogeum was soon filled in with mechanisms to support the other activities), animal hunts, executions, re-enactments of famous battles, and dramas based on mythology. The building ceased to be used for entertainment in the early medieval age. It was later reused for such functions as housing, workshops, quarters for a religious order, a fortress, a quarry, and a Christian shrine.Although substantially destroyed because of earthquakes and stone-robbers, the Colosseum is still an iconic symbol of Imperial Rome and is recorded among the New7Wonders of the World. It's one of Rome's most popular tourist attractions and also has connections to the Roman Catholic Church, as each Good Friday the Pope leads a torchlit'Way of the Cross' procession that starts in the region around the Colosseum.The Colosseum is also portrayed on the Italian version of the five-cent euro coin.

Source: Wikipedia