Perhaps running immigration controls at airports or when traveling by road can create a little stress, as you have to answer questions immigration officials ask you.
In much of Europe, this can be avoided by traveling within the so-called Schengen area, made up of 26 countries, which has abolished immigration controls once a tourist enters its borders.
How it works? If you travel to the Schengen area in Europe, you migrate when you enter the first country and from there, you can visit the other 25 countries without having an officer present to check your passport.
The countries of the Schengen Area are: Germany, Austria, Belgium, Denmark, Slovakia, Slovenia, Spain, Estonia, Finland, France, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Norway, Netherlands, Poland, Portugal and the Czech Republic Sweden and Switzerland.
Three countries can be added to that list, although they do not belong to the Schengen area, they have open borders with countries that are part of that bloc. These are Monaco, the Vatican and San Marino.
as an example; He goes to Europe and enters through Madrid (Spain). There he will emigrate and the officer may ask him what he will do and the places he will visit. But from there, take a flight to Paris (France) in which case he will not have to go through the barrier again.
After touring Paris, he decided to take a train to Luxembourg; You will also have complete freedom. And from there he goes to Brussels (Belgium), also without much control.
Keep in mind that due to special situations, borders may be closed or require documentation, as has happened due to the pandemic.
Also keep in mind that you are not exempt from complying with covid regulations, such as filling out forms, even if you are moving within the Schengen area.
Also, if you ever leave this area and re-enter, you must do the immigration. For example, from Ljubljana, the capital of Slovenia, take a bus to Zagreb, Croatia. And from there he makes a trip to Germany, then he will not escape presenting all the documents.
In the following video I give you an example, traveling through Germany, Poland, Norway, Sweden and Denmark.