1. There is a restaurant on Ermou St that offers 'a plate of steamed vegetarians'.
2. Some things do not seem to be where the guidebooks say they are (e.g., the Museum of Old Musical Instruments).
3. The title of Mark Mazower's history of the city, 'Salonica, City of Ghosts' is apt. You get the feeling of one city built over another (or several others), both physically and culturally.
4. In the early part of the 20th century and for some time before that, the largest single population group in the city was Sephardic Jewish. While according to K E Fleming in Greece: a Jewish History, the hellenisation of the city that began after the Ottoman defeat was not initially greeted with unconditional enthusiasm by the Jewish population as a whole, the Greek Communist Party (KKE), founded in 1918, had as its nucleus the Federacion, a socialist workers organisation founded by Avraam Benaroya. The International Association of Jewish Lawyers and Jurists' special 'Remember Salonika' publication has a lot more information on him: Download remember_salonika.pdf.
5. Once a year, inhabitants of the village of Sochos in the prefecture of Thessaloniki dress up as male goats.