Is it really feasible to build a bridge across the English Channel, as recently suggested by UK Foreign Secretary Boris Johnson? We asked some engineering experts. EMPEROR HADRIAN has his wall, President Eisenhower a tunnel in Colorado, and now Donald Trump wants a wall too. There's no better way for ambitious leaders to put their mark on the world and secure their legacy than by having their names linked to large and imposing structures. Even better if the structure in some way defines a new epoch, or a new way of being - say, for instance, post-Brexit relations between Great Britain and its nearest overseas neighbour.
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