Access to the Acropolis was always easiest from the west and this has always been the main way to the top of the rock. The earliest trail was narrow and winding, allowing its users to observe the ever-changing scenery as they climbed the hill. This path was supported by successive terraces. During the reign of the emperor Claudius (1st century AD) a huge ramp replaced the winding trail. It began in the flat plateau at the foot of the Hill of Ares (near where the present-day ticket booth is) and ended at the Propylaea. The ramp allowed animals to reach the Acropolis, while monumental marble staircases on either side of the ramp were reserved for human traffic.