Milan Cathedral vs Inco Superstack

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Milan Cathedral (Italian: Duomo di Milano Italian pronunciation: [?dw??mo di mi?la?no]; Lombard: Domm de Milan [?d?m p mi?lã?]) is the cathedral church of Milan, Lombardy, Italy. Committed to the Nativity of St Mary (Santa Maria Nascente), It's the seat of the Archbishop of Milan, currently Archbishop Mario Delpini. The cathedral took nearly six centuries to complete: construction began in 1386, and the final details were completed in 1965.

It is the largest church in Italy--the bigger St. Peter's Basilica is in the State of Vatican City, a sovereign nation--and the second largest in Europe and the fourth largest 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