Much of the center and historic areas are easily navigable on foot. If you’re looking for an easy way to get around, a pair of sensible walking shoes is your best bet. Should you need it, the public transport system is pretty comprehensive. Just remember that, with the exception of night buses, tickets must be bought before boarding. They’re found at Metro stations, vending machines at some bus stops, or at newsagents. Ticket inspectors can be anywhere, and they whip their red or blue armbands out of their pockets quite dramatically. Better stay on the right side of the law.