Piazza Sant’Oronzo offers a glimpse into the layers of the city. It is like Alice’s rabbit hole, leading into an undiscovered world. Even though the old town has lush green gardens, no visible river flows through the city. The “underground river of Idume” is fed by groundwater, which collects rainwater from underground basins and re-emerges along the Lecce coastline. Water is a constant presence in the city, even if it is not immediately visible.