CN Tower: 3 years
Canadian Pacific Railway: 4 years
Hoover Dam: 5 years
The atomic bomb: 6 years
Hadrian's wall: 6 years
Channel Tunnel: 6 years
Landing a man on the moon: 8 years
Colosseum of Rome: 8 years
Panama Canal: 10 years
Eglinton LRT: 14 years... and counting.
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