The Portal de Santa Madrona sits on Avinguda del Paral·lel, beside the Maritime Museum, at the base of the old city wall near the port. From metro L3 Drassanes, walk downhill about 3 minutes toward the sea - the gate is on your right. Self-guided: open the app to begin.
The quest ends at Plaça del Portal de la Pau, beside the Columbus Monument, where La Rambla meets the harbour. From metro L3 Drassanes, walk 2 minutes toward the sea. No guide meets you here - the app confirms completion once you reach the water.