Can you see any difference between "He spent a year travelling across/through Europe, giving lectures"? I think the meanings of across/through overlap significantly in this context.
Top answer
Yes, not much difference.
— Clive
Yes, not much difference.
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Thank you, Clive. Do you think that "through" would exclude Scandinavia and some Southern European countries? Across means to me "from one end to the other". Through would probably mean (Portugal-Spain-France-Germany-Austria-Hungary-etc). This is only a suggestion.