Inco Superstack vs Prime 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 Prime Tower, also called'Maag-Tower' in a previous stage of preparation, is a skyscraper in Zurich, Switzerland. At a height of 126 metres (413 feet ), it was the highest skyscraper in Switzerland from 2011 until 2015, when the Roche Tower at Basel (standing at 178 metres (584 feet )) was finished. The building is situated near the Hardbrücke railway station. The tower replaces an industrial facility that's been demolished. According to its developers, the tower's construction, which took 15 years to plan and execute, was a financial success, with its valuation based on rental rates exceeding the building cost by CHF 110 million.The tower and its two companion buildings, Cubus and Diagonal, are used primarily as office buildings. Due to its opening in December 2011, the tower hosts the'Clouds' restaurant on its top floor, a conference center, the Hotel Rivington & Sons on the ground floor, in addition to the offices of Deutsche Bank Schweiz, Homburger AG, Transammonia, Korn/Ferry International, Citibank Switzerland, Infosys, Repower AG, Ernst & Young, Zürcher Kantonalbank and consulting firms.

Source: Wikipedia