I was thinking of doing a trip to London Paris and other cities in England and France next year? What advice can you give? What should I see and do?

I was thinking of doing a trip to London Paris and other cities in England and France next year? What advice can you give? What should I see and do?

I think I will do this for a week probably by myself.

I was thinking of doing a trip to London Paris and other cities in England and France next year? What advice can you give? What should I see and do?
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