From the Fountain of Neptune, make your way back to the Tiled Canal. Follow the path behind you until you reach Medallion's Lake again. Then continue back until you reach the Aeneas and Anchises sculpture. Facing the sculpture, with your back towards the path you came from, head right and you’ll immediately find the Tiled Canal. From here, get closer to the Robillion Staircase. Facing the staircase and with the canal behind you, take the first path on your right. When you pass by a cascade, you are in the Old Maze Garden!