ı wiil go a uerotrıp by train.
ıt ll start amsterdam 25july and ı thınk fınısh 25august.
ı am planing to visit netharland-belgium-france-spain-italy-crotia or greece. my route have an important subject which is ENJOY. actually people prefer to stay one of seaside or travel a country. but mıne is amazing and speedy. ıf u thınk that ıs possible we ll talk trip detail.
take care and see soon
without giving us details on which cities, you like to see (rather than listing countries), it is impossible to give you a good advice.
In a month a lot is possible.
ı ll fallow seaside route.
ıts lıke macellan's :p
amsterdam-brussel-brugge-gent-lille-paris-caen-nantes-bordeux-san.sebastian-bilbao-madrid-seville-garanada-malaga-valencia-barcelona-marseille-cannes(nice)-genoa-milano-venice-rome-florance-pisa-bari-athens-selanika-istanbul(center of civilization)
maybe ıts totaly 5500km wowoowow very long way
alone or with someone ıts not imp. ı ll do ıt.
coz of find myself
If you do it like that you are basicly spending most of you time in trains, busses and planes. If you like to find yourself in a train, you would be fine, but maybe you are better of to take out a little bit of this trip.
Possible? maybe yes, but also crazy. If you would like to ENJOY, I would highly recommend to spend at least 2-3 days in most of the cities you listed, and maybe more in places like Paris and Madrid.
P.S. in Spain you forgot: Toledo and Cordoba.