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As the title suggests, which tunnels/bridges/canals/railway lines/roads (etc.) should have been built, but simply weren't or haven't been? How could they have become reality?
There are some obvious examples: various different plans for crossing the Central American isthmus, Soviet large scale projects all across the USSR, the Florida Straits tunnel, Bering Strait crossings, the Baltic tunnel from Tallinn to Helsinki, and so on.
I'd be interested to hear your opinions and attempts at creating some of these grand works...