The City Sightseeing Tour of Athens (Athens Line) operate daily all year round. Stop 1 is on Syntagma Square, facing the Public Department Store. Each tour takes approximately 90 minutes and has a commentary in eleven languages that traces the history and culture of Athens and Greece. You can Hop On Hop Off from any one of the 15 stops as many times as you wish. The buses run every 15 minutes (1st April-31st October) and every 30 minutes (1st November-31st March) .