Bus Public Transport
The Organization of Urban Transportation of Thessaloniki (O.A.S.TH.), the second largest in Greece, connects the whole city via a dense network of bus lines. You can get your tickets at the O.A.S.TH.’s ticket booths, at the 1200 selling shops or by the vending machines inside the buses. Free service is offered to people with special needs.
Try getting the “No 50 Cultural Route”, departing from the White Tower. It passes through the monuments, important buildings, old neighborhoods, narrating the historic wealth of Thessaloniki in the course of time. Both optic and acoustic information is available for the passengers, in Greek and English.
All necessary information concerning timetables, bus tracking in real time, route duration, best routes etc, is available on the official page of O.A.S.TH. More here.
Additionally, you can download the mobile phone App here.
Thessaloniki sightseeing
The Thessaloniki sightseeing company offers tours around the city with its open deck busses. It is a 70 minute tour, departing from the White Tower, with 8 stops at the most important tourist attractions, while, due to its frequent bus routes you can visit any other historic monuments or places of interest you wish (frequency of arrival 30-80 minutes depending on the season). Commentary is available in 8 languages (Greek, English, German, Russian, Serbian, Jewish, Turkish, Romanian)
More here.