Cairo Tower vs Rialto Towers

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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

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Rialto (often The Rialto, or Rialto Towers) is a skyscraper located at 525 Collins Street, in the western side of the central business district of Melbourne, Victoria, Australia. It was the tallest office building in the Southern Hemisphere as it was assembled. The Rialto featured Melbourne's first skyscraper public observation deck that operated between 1994 and 31 December 2009. It was also the location of Melbourne's first Tower running event.

Source: Wikipedia