This door is a typical Dutch door as there are many like it in bigger cities across the Netherlands. In the beginning of the previous century many 4 or 5 storey row houses were built where the house was divided in a top and a bottom apartment with each their own narrow front entrance. When you enter the door of the top apartment, the first thing you would see is a very steep staircase that leads you to the 3rd floor. This particular is the entrance of a genuine Dutch frat house. As you see there are no Greek symbols used on frat houses here.
Picture by Lisa Saarloos.