First went through the Berlin Wall in 1979 and 5 times after that, first time through was one of the weirdest experiences of my life it was like going back in time, 6ft blonde women East German border guards pushing you about and shoving guns in your face
It was not as bad as crossing the Iron Curtain (East German Border) just East of Wolfsberg though, they had you out of the car and into different huts where your passport and posessions disappeared for about half an hour and you were questioned by KGB types as to why you wanted to pass through the glorious East German Republic to drive to West Berlin, again guns were held at you
You then had to drive down the one single road to West Berlin and it was like a 70 odd mile death strip, you was told never to drive off the road as you would be fired on, it was lined with army posts and tanks all the way, also Warsaw Pact troops in trucks and jeeps driving about randomly stopping and intimidating you
I always flew in to West Berlin after that, but it was something I am glad I experienced, I seen how Communism worked at first hand