Demolished? Noooooo!
The "twin stacks" have been a local landmark for pilots flying visually into/out of YYC for a long time.
I guess with the almost complete reduction of VFR (visual flying rules) flying out of the international they weren't playing much of a role anymore.
Fond memories of coming in from the east and being told "direct the twin stacks" or "orbit over the twin stacks".
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