Inco Superstack vs Ponte City Apartments

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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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Ponte City is a skyscraper at the Berea Area of Johannesburg, South Africa, just next to Hillbrow.

It was developed in 1975 to a height of 173 m (567.6 ft), which makes it the tallest residential skyscraper in Africa. The 55-story building is cylindrical, with an open centre allowing additional light to the apartments. The centre space is known as'the core' and rises above an uneven rock floor. When built, Ponte City was seen as an extremely desirable address due to its views over all of Johannesburg and its environment. The neon sign on top of the building is the largest sign from the southern hemisphere and advertised for the Coca-Cola Company prior to 2000. It now advertises the South African mobile phone company Vodacom.

Source: Wikipedia