Inco Superstack vs Macau 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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Macau Tower Convention & Entertainment Centre (Chinese: ???????????; Portuguese: Centro de Convenções e Entretenimento da Torre de Macau), also called Macau Tower (Chinese: ???; Jyutping: ou3 mun4*two taap3; Portuguese: Torre de Macau), is a tower located in Sé, Macau. The tower measures 338 m (1,109 ft) in height from ground level to the maximum point. Its observation deck includes views, restaurants, theatres, shopping malls and the Skywalk X, a walking tour around the outer rim. It offers the best view of Macau and lately has been used for a variety of adventurous activities. At 233 metres, the Macau Tower's tethered'skyjump' and Bungee jump by AJ Hackett in the tower's outer rim, is the highest commercial skyjump on earth (233 metres), and the second highest commercial decelerator descent facility in the world, after Vegas' Stratosphere skyjump at 252 metres.The tower was created by Moller Architects and is one of the members of the World Federation of Great Towers. Beyond observation and amusement, the tower can also be used for telecommunications and broadcasting. The Grand Lisboa hotel are the most recognizable landmarks in the Macau skyline.

Source: Wikipedia