Large Smoke stack (Sudbury Ontario Inco Superstack)
The Superstack was built by Inco Limited (and later purchased by Vale) at an estimated cost of 25 million dollars. Construction on the structure was underway during the Sudbury tornado of August 20, 1970; the structure swayed heavily in the wind, but remained standing and suffered only minor damage. Six workers were on top of the construction platform when the storm hit, and all survived. the same day was the final day of construction on the stack, with the construction fully completed by the evening of August 21.
The stack entered into full operation in 1972. From the date of its completion until the Ekibastuz GRES-2 chimney was constructed in 1987, it was the world's tallest smokestack. Between the years 1972–75 it was the tallest freestanding structure in Canada.
(Wikipedia) i'm from canada and always thought this was cool, I think it would be really cook idea to add this so you could have the fun of piping every smoke output of your settlement into one big stack :P