Inco Superstack vs Carlton Centre

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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 Carlton Centre is a 50 story skyscraper and shopping centre situated in downtown Johannesburg, South Africa. In 223 metres (732 feet ), it is the second tallest building in Africa following The Leonardo and the tallest office building. The foundations of both buildings in the complex are 5 m (16 feet ) in diameter and extend 15 m (49 feet ) down to the bedrock, 35 m (115 feet ) below street level. The building houses both offices and shops, and has over 46 percent of the floor area below ground level. The Carlton Centre is linked to the Carlton Hotel by a below-ground shopping centre with over 180 shops.

Source: Wikipedia