4hr stopover in Lisbon. What's there to do in that time frame?
4hr stopover? Is that enough time? Perhaps if your plane touches down earlier than scheduled, and your next flight
is within the EU. It would be about a half an hour with the metro to get to the old city (take the red line to the end,
and then transfer to the blue line till the last stop) and you can go explore the Praca do Comercio square.