As a keepsake for my traveling in Germany, I would like to take a pebble from the Berlin Wall-is it illegal (or perhaps frowned upon) to do so? I'm aware that they sell (presumably fake) pieces in gift shops, however to me that would defeat the purpose. Moreover, I'm not entirely sure where to go to actually get a piece (I assume museums are protective of their assets).
EDIT: Thanks @Fiksdal for the answer - while the answer for this question may be fairly obvious, it seems like the legality has flexed over time (as @Jan pointed out, now people are too late to partake in it).
Perhaps even more importantly, when you Google 'Is it illegal to take a piece of the Berlin Wall', nothing useful shows up (save now for this question)