Originally Posted by
mcgahat
All EU. Customs can happen at any border between the EU nations but passport control (document check) is not really needed at they have free movement but there can be random checks. Like traveling between states in the USA really. So, there should be no stamps along the way.
Not all EU - the passport-free travel zone that is relevant here is the Schengen area (which includes most EU countries but not all - the UK and Ireland being notable exceptions - and some non-EU countries, such as Norway, Iceland and Switzerland).
(The UK and Ireland form the Common Travel Area, a completely different zone where, in theory, passport-free travel is possible, at least for British and Irish citizens, although passport checks on arrival in from the UK are now quite common, although the passports aren't generally stamped.)