After we had visited the Basilica di San Marco in Venice, we decided to make our way back to the train station on foot. The journey took us through a seemingly endless maze of narrow streets. As dusk fell, we ran into a group of Spanish-speaking tourists with a guide, blasting Latin American music on a speaker as they navigated the alleyways. It took me a while to realize that the music served a practical purpose: it was a way for stragglers to find the group again in this labyrinthine city.