The best way to navigate Lisbon is through a combination of its iconic yellow trams, the modern Metro system, and walking. For long distances or getting to and from the airport, the Metro is the fastest and most cost-effective method. For the historic, hilly districts like Alfama and Bairro Alto, the historic Tram 28 is famous, though often crowded with tourists; the "elevadores" (funiculars) are also essential for tackling the city's steep inclines. To save money, you should purchase a reusable Viva Viagem card and load it with "Zapping" credit, which works across all modes of transport. Walking remains the best way to soak in the atmosphere, provided you have sturdy shoes for the slick cobblestones.