Eureka Tower vs Inco Superstack

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Eureka Tower is a 297.3 m (975 feet ) skyscraper located in the Southbank precinct of Melbourne, Victoria, Australia. Construction began in August 2002 and the exterior was completed on 1 June 2006. The plaza was finished in June 2006 and the building was officially opened on 11 October 2006. The project was designed by Melbourne architectural company Fender Katsalidis Architects and was built by Grocon (Grollo Australia). The programmer of the tower was Eureka Tower Pty Ltd, a joint venture consisting of Daniel Grollo (Grocon), investor Tab Fried and one of the Tower's architects Nonda Katsalidis.

It was the world's tallest residential tower when measured to its greatest floor, until surpassed by Ocean Heights and the HHHR Tower in Dubai. From 2006 to 2019, it was the tallest building in Melbourne, until the topping from Australia 108. It's currently the third tallest building in Australia, supporting the Q1 in Queensland and Australia 108, in addition to the second tallest to roof (excluding spire) supporting the latter skyscraper. As of 2016 it was the 15th tallest residential building in the world.

Source: Wikipedia

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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