The Berlin wall, or Anti-Fascist Protection Rampart. Of course, it was mainly to stop emigration. Hence why the toughest layer of the defense is on the side with the supposed fascists. (When designing multilayered defenses, you’d generally put the toughest layer on the inside, as that is the one that the most expensive to repair, and by putting it on the inside, you make it the least likely to take damage) Also, East Germany allowed western tourists to enter.
Eh, just copy this design:
The Berlin wall, or Anti-Fascist Protection Rampart. Of course, it was mainly to stop emigration. Hence why the toughest layer of the defense is on the side with the supposed fascists. (When designing multilayered defenses, you’d generally put the toughest layer on the inside, as that is the one that the most expensive to repair, and by putting it on the inside, you make it the least likely to take damage) Also, East Germany allowed western tourists to enter.