Um, pardon me for the intrusion, but people are being a bit hindered from leaving Syria by air right now.

Um, I was thinking of places like Cuba and the former Soviet Union, places that actually are/were like prisons, in that the government doesn't let people leave. Cuba never built a wall, but I guess you could figure that one out.

And I didn't ask a question, I was answering a stupid one. Forgive me for not putting more time into it.

The parallel the OP was making is that these walls usually bring results that those who build them may've not anticipated.

Really? What results did the Berlin Wall have that the Soviets didn't anticipate?