The fastest way to get around Athens is its metro. The Athens city card metro allows you to use the modern metro system, which is still expanding. Travel by metro is economical, fast and safe. The city card metro can be used during the normal working hours of the Athens metro network, which means between 05.30 and 00.30. Please note that one metro line extends all the way to the Athens International Airport, making it the best way to reach the city centre. All together, Athens has three metro lines today, and a fourth one is already under planning. Did you know that after the London underground, the Athens metro has the oldest metro line in the world?