In any city, in any country, go to any mental institution or halfway house you can get yourself to. When you reach the front desk, ask to visit someone who calls himself "The Holder of the Mark." The receptionist will freeze, as though he has known this moment was coming for a long time and is afraid it has finally arrived. He will stutter and tell you there is no such man here, but be insistent. He will eventually yield and after looking around to see if anyone else is here, he will beckon for you to follow him.