Inco Superstack vs Cairo Tower

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The Inco Superstack in Sudbury, Ontario, with a height of 381 metres (1,250 ft), is the tallest chimney in Canada and the Western hemisphere, and the 2nd tallest freestanding chimney in the world after the GRES-2 Power Station in Kazakhstan. It's also the second tallest freestanding structure of any kind in Canada, behind the CN Tower but forward of First Canadian Place. It's the 40th tallest freestanding structure in the world. The Superstack is situated on top of the biggest nickel smelting operation in the world at Vale's Copper Cliff processing centre in the city of Greater Sudbury.

In 2018, Vale declared that the stack will be decommissioned and dismantled beginning in 2020. On July 28, 2020, Vale declared that the stack had been officially taken out of service, but would remain operational in standby mode for two more months as a backup in case of a malfunction in the new system, after which the dismantling of this Superstack will begin. In addition to further reducing sulfur dioxide emissions by 85 percent, the decommissioning of the pile is expected to cut the complex's natural gas consumption in half.

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