Travel to Istanbul by train from France/Germany/Rome?
My boyfriend and I are planning a European trip this September and though we haven't decided exactly where we'd like to go, we have some ideas.
One thought is land in London, stay a few days, then perhaps overland to France, maybe a stop in Germany after, even Rome. But I would really like to go back to Istanbul and wonder if there is a convenient way to get there by train (I've flown and it's frankly boring, plus with security and customs etc I think it might not be too much of a time difference).
Obviously we're open to various options regarding starting points, so what do you all think and do you have references (websites would be great)!?