The Metro stations are well worth seeing as they are kept spotlessly clean. At the Syntagma and Acropolis stations you will find a large collection of antiquities on display. There is a tram from the centre (Syntagma) running along the coast to Glyfada (50 minutes) and Voula (60 minutes). Buses, trolley buses and the Metro run until around midnight. The tram runs between 5:30am and 1am (until 2:30am on Friday and Saturday). Airport buses all run 24/7. The airport bus tickets are not valid for other public transport services but only for a single journey. Ferries out to the island leave from the harbour in Piraeus or from Rafina.