Since today is the 26th anniversary of the fall of the Berlin Wall, I thought it was an appropriate day to post this map of the Berlin Wall, including checkpoints.
Map of the Berlin Wall, showing checkpoints. Created by Ericmetro [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], 9 January 2015. Based on Occupied Berlin by Stefan-Xp, derived from Berlin-wall-map by ChrisO. Available from Wikimedia Commons.