My 18 year old son and I am going on a trip of a lifetime. We will only have backpacks, flying into Rome 5/13 departing Paris 5/24. We have global train passes which will be our primary mode of transportation. For longer trips between cities we would prefer overnight trains so we don't "waste" sleeping hours. Our must see list includes Berlin, Rome, Venice, Paris and Auschwitz. Two years ago we spent 10 days in Germany (Mannheim, Frankfurt, Munich, Heidelberg, "Disney" castle, Koblenz, Dachau), but missed Berlin. I've been doing some research online about places to see, but it is overwhelming. I know that trying to "see" everything will make us crazy, but I do want to see as much as we can within reason. I was thinking we would stay overnight in Rome and Berlin at a minimum while utilizing sleeping compartments on overnight trains with the right itinerary. I am open to any possible itineraries as long as they include the must see cities. Please help before I make myself crazy :).
P.S. My son likes unusual macabre type things, so if you have insight into anything like this I would love to hear it. There is a catacomb in Romania that has used the bones to make furniture, chandeliers, etc. that really intrigues him. It may be out of reach for us on the trip, but again, we are open to any ideas.
Thanks!