It depends on which country. If your a UK passport holder you can travel through all of Europe with no added Visa requirements. Leaving Europe means visa's of some kind, some obtainable at the border eg. Turkey but some that have to be obtained before leaving home eg. Russia
Reply to this Each country has own set of rules about visa, entry to country, etc. Would be much better to ask for specific country, to get more precise answer.
Reply to this Yes each country provides own country visa to travel and stay.
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