 This is Lisbon, Portugal and it is one of the oldest cities in the world. It's characterized by its windy, compact streets and hilly geography. Nestled on the banks of the Tagus River, it has long-charmed visitors with its architectural wonders, historic neighborhoods and cultural vibrancy, making it a top travel destination. And tourism is a major part of Lisbon's economy with six tourists for every resident in 2022. But this increase in tourism has stretched Lisbon's transport network to the brink. Overcrowded buses, hour-long waits for tram rides and closures for maintenance are pushing transit to its breaking point. How did Lisbon get here? And who does its public transport really serve?