My friend and I were in the sleeping quarters of a train departing Berlin on the way to Poland. Stupidly, I trusted him that we wouldn't need visas, as he had done this journey before.
Wine was a big part of our journey as we departed, bags packed. But when we reached the border, at the "other" Frankfort, the soldiers with guns quickly reminded us that the iron curtain was still in some kind of effect.
Well we were stuck at the border at 2am but made it back to Berlin in time to crash on our sacks in the Tiergarten without molestation. I wanted to make it to Russia and still do. Probably to test their gay bars in Moscow while it's still sketchy.
Nowadays everyone goes to Asia, forgetting the vast treasure of eastern Europe.