To establish a border signifies defining a fixed point from which to start and to which to refer in order to circumscribe controlled and measured environments. It is not important whether it is a border between states and regions or private and public spaces, because the main effect of the border is to sanction a diversity. This proposal will analyse three case-studies that, starting from antiquity to the contemporary age, have proposed over time different ways of conceiving the border, making architecture the convergence point. The first is the Temple of Diana at Ephesus, a monument created by Greek artists located in Persian territory. It stood on the peninsula of Anatolia, the border land par excellence in the Hellenistic world,...