So you're a rich, famous director who had this little problem with an underage girl back in the 70's and you need to do a movie in two countries that will put you behind bars. What to do?
If you're Roman Polanski, you bring Boston and London to Germany. R.P. is directing "The Ghost" in Krautville. He can't return to the U.S. and England will extradite him. So Roman has built him some imitation cityscapes in the streets of Deutschland.