A Trans-Atlantic tunnel
It's not so fantastic as you may think, study groups of engineers are looking at the possibility of such a project.
The tunnel would be a rail one of course with Magna-Trains floating on a magnetic field, they're experimenting with these in Germany just now.
To build one directly from England to New York would cost $6 billion per kilometer and it's 5,000 kilometers to New York.
Another route they're looking at which would only cost half as much is from Newfoundland to Greenland then to Iceland and finally to Scotland, the rails would travel overland in both countries, but as I've said before when I'm asked when we're gonna get decent politicians, "not in my time".