Yellow Trolleys and Blue Buses can take you anywhere in the city and in the suburbs.The Trolleys run on electricity and the stops are yellow. The Blue bus-stops are blue. Tickets cost 1 Euro and must be bought from a kiosk or at special stands in main squares and at some main bus terminals. They are sold individually or in bundles of 10 and must be validated by a machine on the bus. Buses and trolleys run every 10 to 30 minutes and can be stopped by waving your hand. There is a small blue bus that goes through central Athens. You can find maps on many of the bus stops and you can also get one from the Greek National Tourist Organization office on Amalias street by Syntagma Square.
For further information please visit the
Athens Urban Transport Organization website
Download Athens Public Transport Map