He escaped to south America. A bunch of them did. Still a whole German city there. Hunting Hitler has a little series explaining why they are looking for the answers. The dna on his skull that Russia has turned out to be a 30 yr old woman.
I'll play devil's advocate here and mention the DNA testing done on the teeth not long ago that supposedly squashes the whole "Hitler escaped" story.
That said, he was a smart SOB, so it wouldn't surprise me if he anticipated dental records testing after his "death" and planned accordingly.
I've seen about 1.5 seasons of Hunting Hitler and it was awesome. The rest is on my list to watch.
Do you remember the house they were looking at from a boat, but couldn't get access to (unless it happened in later seasons)? Josh gates and Destination Truth got in it, if you want to go find that episode.